Snowplow, I have heard of people using your method, and if it works out for you, that’s all that matters.
I tried the method you describe some years ago, as I have tried almost every other shooting suggestion I have ever heard of, and didn’t stay with it very long. This is the problem I had with it: The way the instinctive method works is that the mind unconsciously works out a solution for where you should hold your bow arm to hit the spot you are focusing on. This is a very simple concept and works out very well for some people.
Now we change that a little, and instruct the mind to find a solution instead for where to hold the bow arm to hit a spot 6” above or 6” below the spot we are focusing on. Or, to state it a little differently, we ask the mind to pretend the spot is still 30 yards away and hold the bow arm in the correct position for that shot, while focusing on a spot above or below the spot we actually want to hit in order to correct the ranging error. My mind didn’t like being tricked, and soon reverted to finding a solution for hitting the spot I was actually focusing on, which was of course above or below the spot I wanted to hit.
I understand the problem of gaps being too large to effectively use gap shooting for short shots, and the problems with using string walking, a fixed crawl, or a high anchor to reduce the gaps.
The solution for me was to back off from gap shooting, but to still be conscious of the position of the point in my out of focus peripheral vision. I always focus on the spot I want to hit, and don’t worry about where the point ends up. I believe I am using the method Howard Hill described as split vision, or is now sometimes referred to as instincti-gap.