From what i saw, you are really making improvements on Murray's fh megyaem30! Keep going !
It is also great to see, that so many others of the TE community are offering advice and support .
One more hint from me:
Be careful animating the racket more specifically the grip. Personally, i never animated the racket in my anims. I always move just the wrist.
As you know, when you working with the biped, you only see the middle finger of the hand. I found it hard to see where the racket will actually end up.
I messed up my first anim by moving and rotating the racket. Maybe you have better fortune that i had.