That's actually not a good thing... the more grip there is touching your hand, the easier it is to impart torque. It's the reason that 99.99999% of tournament archers shoot a thinner grip, or even off the riser (read no grip at all). Mathews knows this too actually, as their target bows are sans the blocky, bulbous mass of wood they attach to their hunting bows.

You may have got used to it, but most of the better archers I know remove it and go for a Tronjo or similar grip. When I shot Mathews, I would order my bows and my aftermarket grips on the same day. And back then, a good set of strings to replace the junk factory ones before I ever put an arrow through them... though I've heard they've come a ways in that department.