I read that you get your eye as close to the peep sight as you can, just look at the front sight and the target and open both eyes. However, I cannot shoot good groups with both eyes open with my HW 30 or FWB 300. I do better with one eye closed but not super precise groups. If I just practice with one eye, can I get the same results as keeping both eyes open? I am aiming through my right eye which seems to be the dominate one. I have tri-focal glasses I am shooting with. Any hints?