Stiffness and balance problem

[Aceman]

Stiffness and balance problem on Maxply Mcenroe

I need your opinion about this question:
I tried a Dunlop maxply mcenroe,it is very good for me but when I serve I feel something in my shoulder.I've used my liquidmetal radical mp and I felt no problem in my shoulder,so I throught that the problem could be the balance (3pnt headlight of dunlop VS 4pnt headlight of head).
My question is:if I customize my dunlop and I use lead tape to modify headlight (from 3 to 4/5/6),the shoulder problem could reduce or my supposition is wrong?

 

[matchmaker]

1 pt HL will not change a lot, I guess the stifness of the racquet could also be playing here, as you mention in the title of the thread, but in your post you don't develop this point.