I hope this is the right place, if not please delete
i have a bobtailed 1911 in 357 sig(scorpion fastback carry commander size). I'm finding that when i shoot the poa is constantly low by 2-3 inches at about 8-10 yds. Windage is fine and the groups are good. I "think" I've discovered the problem. Just as I'm shooting I must be doubling down on the lower part of the grip with my ring and pinky fingers grip which is pulling my poa down. The bobtailed design doesn't have the squared off grip that pushes off of the heel of my palm. So I've been playing around with my shooting grip. If I hold the grip any tighter I start to shake. So I'm not sure how to fix the problem. I'm also considering adjustable sights which may allow to compensate for the low impact.
Has anyone experienced this type of problem. I also have the same issue with bobtailed .45's so I don't think it is a caliber problem. Love the gun and want to keep it.