I was on a circus handstands course and I learned there something that might be helpful. 🙂
In the process of learning the press handstands you have to first learn to descend your legs slowly. Tucked knees or straddle v legs make it lighter. When you feel you are losing the control, lift up again. Repeat. Do it against the wall or pole until you can perform the move.
Also try to kick up and hold your knees in tucked position before lifting them up. You can practice this on the floor without support. Awesome for abs too!
The hollow body! No bananas! If you can’t keep the hollow position, the move is still too hard. Practice hollow body position on the floor, it is very good ab workout and helps your body to adabt the move.
The progress takes time. I have estimated that It’s going to take me year or two for me :D.. But there’s nothing but time and patience.