Created attachment 24645 [details]
Current width compared to proposed
As you can see on attached image, glyph width of letter 'ы' looks too wide. Sometimes inter letter interval even looks as a space. I think, that width of this glyph should be reduced at least by 50-60 points. Second line in image is rendered with reduced width of letter, and it looks much better.
Following patch is applied to font:
--- src/DejaVuSans.sfd (revision 2353)
+++ src/DejaVuSans.sfd (working copy)
@@ -61320,7 +61320,7 @@
Encoding: 1099 1099 1099
AnchorPoint: "above" 797 1147 basechar 0
Also same applies to oblique and bold typefaces.
The effect you're seeing is not because the glyph being too wide, but because of hinting. So, it shouldn't be fixed like in your patch, but instead by editing the hinting instructions. This should be quite easy to fix, I'll try to do this tomorrow.