One of the ways I find that instinctive archery is actually easier than other shooting techniques is the relative ease of focusing on the target. Of course, in instinctive archery, we still need to refine our focus on the target, but generally this mean "picking a spot" rather than focusing on a broad area of the target. But at least in instinctive archery, we are not tempted to focus on something other than the target, because there is really nothing else to focus on (I know, maybe a deer's antlers, but that's another story).
I shoot gap at longer distances, and found that I was missing to the left on many shots. Knowing that every element of form is critical at longer distances, I took apart everything I could, wondering if I was somehow torqueing the bow, plucking my release, not following through, or anything else I could think of. What it came down to was that in trying to keep the arrow tip in my peripheral vision, I was focusing somewhere other than on the spot I wanted to hit. It wasn't that I was focusing on the arrow tip; I know enough not to do that, but I wasn't focusing on the spot I wanted to hit either. It was hard for me to keep the arrow tip in my peripheral vision while continuing to focus on the spot I wanted to hit, so sometimes my focus drifted - I don't know where. But when I found out what I was doing, it became a relatively easy thing to solve.