diff --git a/FontTestGDX/src/FontTestGDX.kt b/FontTestGDX/src/FontTestGDX.kt
index 6a5eeb8..0d70cd1 100755
--- a/FontTestGDX/src/FontTestGDX.kt
+++ b/FontTestGDX/src/FontTestGDX.kt
@@ -26,7 +26,7 @@ class FontTestGDX : Game() {
 
     lateinit var camera: OrthographicCamera
 
-    private val testing = false
+    private val testing = true
 
     private val demotextName = if (testing) "testtext.txt" else "demotext.txt"
     private val outimageName = if (testing) "testing.PNG" else "demo.PNG"
diff --git a/assets/thai_variable.tga b/assets/thai_variable.tga
index 4783b52..590787a 100755
--- a/assets/thai_variable.tga
+++ b/assets/thai_variable.tga
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:134e9efce4e298b623bb3f977c5a8d65d05bdc3924e4be0564cebb4683ee5692
+oid sha256:ceb3411baa2b6aabb7a2de2404abed96082b057a72ae5d98632c062fdb0c3dd6
 size 122898
diff --git a/demo.PNG b/demo.PNG
index 772d2f2..629835e 100644
Binary files a/demo.PNG and b/demo.PNG differ
diff --git a/src/net/torvald/terrarumsansbitmap/gdx/TerrarumSansBitmap.kt b/src/net/torvald/terrarumsansbitmap/gdx/TerrarumSansBitmap.kt
index 6aa5fbf..226c3a0 100755
--- a/src/net/torvald/terrarumsansbitmap/gdx/TerrarumSansBitmap.kt
+++ b/src/net/torvald/terrarumsansbitmap/gdx/TerrarumSansBitmap.kt
@@ -849,7 +849,7 @@ class TerrarumSansBitmap(
 
 
         var nonDiacriticCounter = 0 // index of last instance of non-diacritic char
-        var stackUpwardCounter = 0
+        var stackUpwardCounter = 0 // TODO separate stack counter for centre- and right aligned
         var stackDownwardCounter = 0
 
         val HALF_VAR_INIT = W_VAR_INIT.minus(1).div(2)
@@ -963,15 +963,14 @@ class TerrarumSansBitmap(
 
 
                         // set Y pos according to diacritics position
-                        if (thisProp.alignWhere == GlyphProps.ALIGN_CENTRE) {
+//                        if (thisProp.alignWhere == GlyphProps.ALIGN_CENTRE) {
                             when (thisProp.stackWhere) {
                                 GlyphProps.STACK_DOWN -> {
-                                    posYbuffer[charIndex] = H_DIACRITICS * stackDownwardCounter
+                                    posYbuffer[charIndex] = H_DIACRITICS * stackDownwardCounter * flipY.toSign()
                                     stackDownwardCounter++
                                 }
                                 GlyphProps.STACK_UP -> {
-                                    posYbuffer[charIndex] = -H_DIACRITICS * stackUpwardCounter
-
+                                    posYbuffer[charIndex] = -H_DIACRITICS * stackUpwardCounter * flipY.toSign()
                                     // shift down on lowercase if applicable
                                     if (getSheetType(thisChar) in autoShiftDownOnLowercase &&
                                             lastNonDiacriticChar.isLowHeight()) {
@@ -979,22 +978,35 @@ class TerrarumSansBitmap(
                                         //dbgprn("lastNonDiacriticChar: ${lastNonDiacriticChar.toHex()}")
                                         //dbgprn("cond: ${thisProp.alignXPos == GlyphProps.DIA_OVERLAY}, charIndex: $charIndex")
                                         if (diacriticsType == GlyphProps.DIA_OVERLAY)
-                                            posYbuffer[charIndex] -= H_OVERLAY_LOWERCASE_SHIFTDOWN * (!flipY).toSign() // if minus-assign doesn't work, try plus-assign
+                                            posYbuffer[charIndex] += H_OVERLAY_LOWERCASE_SHIFTDOWN * flipY.toSign() // if minus-assign doesn't work, try plus-assign
                                         else
-                                            posYbuffer[charIndex] -= H_STACKUP_LOWERCASE_SHIFTDOWN * (!flipY).toSign() // if minus-assign doesn't work, try plus-assign
+                                            posYbuffer[charIndex] += H_STACKUP_LOWERCASE_SHIFTDOWN * flipY.toSign() // if minus-assign doesn't work, try plus-assign
+                                    }
+
+                                    stackUpwardCounter++
+
+                                    dbgprn("lastNonDiacriticChar: ${lastNonDiacriticChar.charInfo()}; stack counter: $stackUpwardCounter")
+                                }
+                                GlyphProps.STACK_UP_N_DOWN -> {
+                                    posYbuffer[charIndex] = H_DIACRITICS * stackDownwardCounter * flipY.toSign()
+                                    stackDownwardCounter++
+
+
+                                    posYbuffer[charIndex] = -H_DIACRITICS * stackUpwardCounter * flipY.toSign()
+                                    // shift down on lowercase if applicable
+                                    if (getSheetType(thisChar) in autoShiftDownOnLowercase &&
+                                        lastNonDiacriticChar.isLowHeight()) {
+                                        if (diacriticsType == GlyphProps.DIA_OVERLAY)
+                                            posYbuffer[charIndex] += H_OVERLAY_LOWERCASE_SHIFTDOWN * flipY.toSign() // if minus-assign doesn't work, try plus-assign
+                                        else
+                                            posYbuffer[charIndex] += H_STACKUP_LOWERCASE_SHIFTDOWN * flipY.toSign() // if minus-assign doesn't work, try plus-assign
                                     }
 
                                     stackUpwardCounter++
                                 }
-                                GlyphProps.STACK_UP_N_DOWN -> {
-                                    posYbuffer[charIndex] = H_DIACRITICS * stackDownwardCounter
-                                    stackDownwardCounter++
-                                    posYbuffer[charIndex] = -H_DIACRITICS * stackUpwardCounter
-                                    stackUpwardCounter++
-                                }
                             // for BEFORE_N_AFTER, do nothing in here
                             }
-                        }
+//                        }
                     }
                 }
             }
diff --git a/testing.PNG b/testing.PNG
index 5dd3bb0..185a67c 100755
Binary files a/testing.PNG and b/testing.PNG differ
diff --git a/testtext.txt b/testtext.txt
index 481a614..81f1aff 100755
--- a/testtext.txt
+++ b/testtext.txt
@@ -1,4 +1,5 @@
 
  A ดุ ตี ปู่ พี่ ป่ ม่ ปั มั พีุ
 
- U̸ u̸
\ No newline at end of file
+ ทิ่ท่ท่ิ ปิ่ป่ป่ิ ทิ้ ปิ้ มำด มําด
+
diff --git a/work_files/thai_variable.psd b/work_files/thai_variable.psd
index 3a4f11b..662744a 100644
--- a/work_files/thai_variable.psd
+++ b/work_files/thai_variable.psd
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:b68e8c5f51f896fd24f4c93db2bc8488acb3959da791599733d9333f26117dd7
-size 122981
+oid sha256:d20dd7374ebacdbb38c8d8a431d4ba357f478ff18735b7a7f169c158f18569ab
+size 123326