My Gamo Swarm Fusion Gen 2 has barrel droop causing shots to be 10" or more low at 25 yards. Iron Sights when adjusted give 1" or less grouping on center of target. I have tried 3 scopes and none adjust enough. My Hammers 4x12 is long and has difficulty even fitting behind magazine/break. Might have to stick with stock Gamo or other smaller scope, but they all can't adjust enough for droop. Would I be better served with Sportsmatch .75mm one piece droop mount with arrestor pin or FX No Limit rings that do not come with arrrestor pin? Would the .75mm compensate for 10"+ low shots? All scopes give great groupings, just all well below target.