I second or third or what ever on the tab. I tend to release more consistently with a tab than a glove or just the three finger tip glove. With a split tab I shot one above and two below because I got a more consistent anchor point in the corner of my lip.
I have not shot a lot of traditional in many years. I seem to remember that bare arrows never shot the same as fletched arrows. for one thing the fletching will hit the arrow rest in the riser and get a small bump and your POIr(point of impact) will change with fletching material. I always shot long turkey feathers on cedar arrows.
Another variable to check is the brace height.
Like I said I may be all wet on this because I have not shot traditional in a long time, but this is the old man's recollections.