You are jumping ahead, your toes are down, and you are planting you hand on the horses neck. Try and follow your horses head with your hands and move them up more on his neck. Leaning on your hands is not a bad thing, just don't plant them that far down on his neck.
Also try and sit and wait for the jump to come to you, you are anticipating which results in jumping ahead. Don't go up in 2-point until your horse front feet leave the ground. Jumping ahead is a hard habit to break. It can also become dangerous. I jumped ahead one time, and my horse took a long spot and caught the rail on her front feet and she feel, luckily she didn't fall on me, but it was close.
Try not to grip with your knees, and keep your heals down. If you heal is down and your calf is on you won't have to rely on gripping with your knees and using your hands for balance.