With your Hydra's ticking at 110 mil per, and having two of them that gives you 10 hits per tick or 1.1 billion damage per tick. I find it hard for Meteor Shower to come close on a mob not moving. That's just massive damage. On top of that you're still throwing down meteors anyways.
Even better is to check your breakpoints and make sure your hydras are ticking at the best speed you can get.