If you were shooting real feathers.... or a fairly strong helical that would usually be the case Dan.

The only other thing that leaps into my mind is that at longer ranges you might be referencing a different part of your pin.... meaning for example that I personally use the very tip top of my pin at 25 yards and less... but past thirty I tend to blot my target out with my pin.... shooting with both eyes open I feel makes you more accurate in general.... but you have to learn your own little nuancies (I shoot with both eyes open.. which is why I wrote this).