Replying to Timing

I've been trying to get 3's down, and half the time I land fine, half the time I mess up.  I've figured out that it is because I pop too early, and then start rotating while I'm popping.  So then I decided to try popping what I felt to be way too late, and spinning after I have already taken off, which works, yet makes me feel uncomfortable in the air.  Any tips on making it so that I can get the timing down, and also whether or not I am right in rotating after you've already popped? Thanks!