I shoot a Starmaster with sights,release aid and prong rest. The arrows are carbon, weigh 5.2 grains per pound and ep26 fletches.

Now the problem. I seem to be shooting left most of the time. My 3D scores are erratic, one weekend I will shoot in the 90's and the next I am in the 40's. I took the bow to the Pro Shop and they gave it a "clean bill of health"

It appears to be my grip. Sometimes I just find the right spot and everything falls into place. But I just can't seem to find the that right grip spot consistently.

Does anyone have any ideas on how I can consistently grip the bow correctly and shoot good scores? Some club members have even got marks tattooed on their bowhand