I was having similar results from strictly instinctive shooting. I shoot three under now, which has helped. I have now changed my approach after watching one of Clay Hayes video. I let my bow arm figure out the distance to the target(like instinctive) but I sight down the arrow for my left/right alignment. I have noticed a considerable improvement in my grouping and especially stumpshooting. I find shooting groups very monotonous, but hitting targets at un-known distances exhilarating! Something that has helped me while having some backyard practice is to shoot at an object in front of my block. This helps a bunch. I find the bag/blocks hard to focus on. I have been jamming an apple on a stake in front of the bag, that has made a big difference. I will try to get up there and have a round or two with you Don!