- Increase Vishap's hitbox so shooting at his legs actually matters. Nobody should have to explain to a newbie why shooting at a huge boss legs does nothing. That stuff should be obvious.
- Bump the damage of the canons to 3k/hit instead of 2k. This will not only allow the cannoneers to target the adds outside of Vishap's hitbox more often if the tanks are screwing things up, but will also allow them to close the DPS gap from a failed tower shot or lack of good DPS on the boss's butt.

Problem solved.