what head weight should a putter be
A standard weight putter 34 inches long is close to 19 ounces. This depends on shaft and grip weight. With a standard Winn grip, stiff steel shaft and the most common head weight of about 12.3 ounces (350 grams) the dead weight of a putter would be about 18.5 ounces. I think that you have increased the weight of your putter because of the oversized grip.