It just takes alot of practice, when i started hunting groundhogs with a bipod 5 years ago I also shot around 2 inch groups at 100 yards, Now I somtimes cant tell the difference between a target i shot from the bench and one from the bipods. Every gun that i use for ground hogs gets range time with the bipod on, How good is your trigger, A heavy trigger really stands out for the worst when using bipods, you might want to look into a muleypod, It might solve your problem, but if your shooting prarie dogs at high numbers it might just be a pain in the butt to adjust constantly.