I've acquired a 2010/2011 35" Squareback2 circle H marked as "Heavy", with 2 15 gram weights. 1. I'm curious what the head weight is without the additional weights. 2. Is the head, itself, heavier than the standard Squareback2, or is it the weights that make it "Heavy"? 3. Will replacing the 15 gram with 10 gram, will that make it a "standard"?