Weird Grip Size

When I hold the forehand with the "traditional Head butt cap I feel the forehand suit the best for me, but when I hold the two handed backhand with the Head rectangular pallet I can´t rotate well
so I for the forehand it feels the size for me, but the backhand it feels too big or thicker, so I need more a rounded pallet to have a better grip.

So my final though on the best grip for me it would be a custom grip, like a combo of a Head TK82s buttcap or Dunlop buttcap + Prince or Babolat pallet

I dont know if that is possible to do
 
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