I think we focus on arm speed and slow motion a little too much these days. Watch most pros throwing and their arms don’t move that fast when they throw. But when the disc comes out it shoots out like a cannon faster than their arm is moving. Yes. They shift weight properly. And yes, their posture is correct. But those things won’t get you that kind of throw. You can do those things right and still have the disc come out as fast as your arm is moving.