tbh, the manip wasn't that great. You reversed ukes direction around a lot, which took away from it a lot.
The biggest thing i can say is that instead of trying to hit uke up into the air, try rather to start spinning him in the air, which makes it a lot easier because then all of what you do is keep adding to the momentum he's already built. Generally when you do that all you need to do is just keep adding more force and he stays up much more easily.