[Renzokuken]

Just micro your hydra's away from an incoming storm. And don't send 24 at once otherwise they all just bunch up. HT's are very expensive, 150 gas is a lot, plus the 200m/200g to learn psionic storm. I guess you could use queens but i reckon your money is better spent elsewhere.

I wouldn't bother with guardians. Muta's are more versatile. You're basically spending money to make your unit slower and only attack ground. Sounds like a waste of money to me. Keep your Muta's, they are excellent at harassing. If they counter with Corsairs (They should build a few for Overlord hunting anyway) just move them around with Hydra's.