Any advice for a guy to get better accuracy. At 20 yards I'm getting like a 2.5" groups with my umarex gauntlet I have a bunch of the mods done from hajimoto. Got plenty of power I just need to reign it in mostly been shooting jsp king heavy 33.95 grain I want to be able to get it down to an inch at that distance at least. I have a Benjamin p rod that is much more accurate. Any help would be great thanks a bunch