1. ZWNJ - Avoid breaking on both sides, ZWNJ does not make as a standalone
  block. Break on the right side
2. Make sure break happens in both side of independent vowel. The comment
  was correct, but explicit left side break rule was missing
3. Simplify the combining mark rules for bindu etc. Explicitly define the
  non breaking left, leave the right side for contextual rules.
4. Simplify Virama rule - since there is no case of vowel sign+virama in Hindi,
  just right side no-break rule is enough. Preceding Consonants has no explicit
  right side rule.

Copy these to Marathi too.

Thanks to Eric Muller (emuller@amazon.com) for the suggestions.