did you try to move your rest in 1/32 incruments to see if that helps I did that today with my up and down and side to side just remember to make very small adjustments and document each move it will help you remember what you did. on my set up it did wonders but if it does not help at all, all I can think of is arrow stiffness or maybe fletching contact. good luck and try not to get to frustrated. p.s I also found out that I had some arrows that just would not group with the rest, I marked them and documented the patterns and used the good grouping ones to set up my bow helped a lot.