You can make the case mathematically to raise your POI at the 27. If you assume adding 1/16” is about 2” at 40 yards, 1/8” is about 4” and that is the reason you miss a target then you would raise your POI. In my experience, missing a target from the 27 is not because my POI is to low, but rather a lack of concentration and focus on the target. I do increase cheek pressure at handicap yardages. The margin of error decreases significantly at the 27 and the fundamentals become a lot more important.