Understand accumulators. By having the grip under the heel pad of the left hand you are maximizing power. By having the grip under the thumb pad of the left hand you are minimizing power. Changing your left hand grip in this respect will change the travel distance of the club head. THerefore, your distance control can vary greatly with know more or less effort. So know,know,know your left hand grip.
THen understand which accumulators are in place and being utilized. Are you using #1 or #4? No wristcock is needed, so where does the putter lie in your left hand.
Now go to hinges. An angled hinge will feel like "no roll", the horizontal hinge will feel like "roll", and the vertical hinge will feel like a "reverse roll", unless your hinges have problems. There are visual equivalents you should look, look, look.
From here make your decision on how big or small your grips (on putter) should be.