This is my 1st rig and here is my most recent example

[calm lodge]

, its a bit laggy due to me workin on a huge canvas but when exxported its smooth c:
please let me know on any way i can make the hair look less cracky , and the ears more 3d like !
Here is 3 examples , Cat ears , Human ears , and no ears ( no ears is recorder in vtube studio when its smooth )

[calm lodge]

did some fixing and exported the ears c: , gotta figure out why one of the ears is weird

[void talon]

i would say the side pieces of the hair moves up a bit too far when the model looks up.
i also think the physics for them look a bit choppy. i would try keeping your physics in warp deformers and only keeping 1 deformer to one parameter.
i also think you could benefit turning the shaking influence down a bit!