I'm hitting consistently right 2 inches at 20 yds even though I have adjusted scope full left. New rings, (second set) and I have even put a feeler gauge between scope ring gaps to ensure uniformity.All screws are tight with blue loctite to the point I that I am afraid that I will shear bolts if I go any farther. Gun is a Crosman NP2 22 caliber. Please advise. Thanks