not sure if this actually answers your question, but i think the reason you didn't get explosive height is due to two reasons:

first reason being that a lot of your joint movements are timed correctly (such as kicks or extensions that are way too early or way too late). to fix that, you should work on flow. flow isn't just pretty, but it gives you the ability to do more with your tricks, such as reaching ridiculous heights. i feel like the perfect way of doing this is doing good ol' spin moves.

second reason would be that your stiff joints kept you grounded, and that you weren't transferring enough momentum to get yourself off of the ground. during tricks like backflips or gainers, most people lift their arms to generate/transfer enough momentum to lift them higher into the air

hope this sort of helped, glad to see you back around