yo dude everything looks pretty good with your setup except a few things::
Okay once you set up everything is fine.
Right when you put your other hand is where the problem is though. I see what your doing is trying to throw the 90' right when your right hand goes down which isnt a problem, if you know how to do that. Haha.
Basically control your 90's setup and go into a 2H handstand first and hold it. Once your used to that, do the setup, go into a handstand take your left hand off and spin. In order to actually spin in the balance so you dont fall as easily you needa be in a full handstand. If you need any questions or a 90' video that works just hit me!