So my hammer on the Wild cat got deformed like they all do sooner or later.I bought a new one from FX USA.The one I took out was pushing a 18 grain pellet at 865 FPS .Put the new hammer in and went from 130 bar up to 150 bar the best I could get was 750 FPS. WTF weighed both hammers and the new one is a lot lighter than the old one.Do you think that is the problem.where can I get a heavier hammer other than fxusa