I hope this will position x-labels correctly vertically

And without any weird hack.
But by just finally figuring out how to
correctly offset the drawing from the font glyph size

MPChartLib/src/com/github/mikephil/charting/utils/Utils.java

@@ -611,17 +611,16 @@ public static void drawXAxisValue(Canvas c, String text, float x, float y,
         float drawOffsetX = 0.f;
         float drawOffsetY = 0.f;
 
+        final float lineHeight = paint.getFontMetrics(mFontMetricsBuffer);
         paint.getTextBounds(text, 0, text.length(), mDrawTextRectBuffer);
 
-        final float lineHeight = mDrawTextRectBuffer.height();
-
         // Android sometimes has pre-padding
         drawOffsetX -= mDrawTextRectBuffer.left;
 
         // Android does not snap the bounds to line boundaries,
         //  and draws from bottom to top.
         // And we want to normalize it.
-        drawOffsetY += lineHeight;
+        drawOffsetY += -mFontMetricsBuffer.ascent;
 
         // To have a consistent point of reference, we always draw left-aligned
         Paint.Align originalTextAlign = paint.getTextAlign();