I have wondered why so often I see 3 under shooters with a nock above and below???? Wanting some feed back on this issue because of what I saw this morning. I was playing around with 3 under, nocked an arrow without the point, not planning on shooting, just messing with nocks when I noticed my shaft lifting up at full draw. So, it got me to thinking. Of course it will be shot only with a point.... but this could possibly affect up and down groups. So, is this why I often see nocks below, to stop the upward pressure from 3 under? Thoughts