Okay, stop misting.
Are the leaves cupping downwards too, like an upturned canoe?
Do they seem a little more green, or DARKER, duller green than they had been?
Sounds like suffocation. But without pics or some pH numbers, I still can't rule out a pH problem.
You need a lot more air flow than you are giving them.
Also, it's important to be able to test pH. The drop-style liquid tester is only like $8 at the grow shop... yay!