I usually practice between the morning and evening hunts. Having jsut shot the bow I know all is well. Are you an experienced bowhunter and just stepping to instinctive shooting? Maybe the suggestion of shooting something new is a top shelf idea! I can't even imagine how having pins can deter ones shooting ability?

As far as instinctive shooting groops go, It might be that the first shots are aimed at the target and then you start aiming at the arrows in the target resulting is a large spread in your groups. Think of it like shooting a rifle. Say it hits 1" high and 1" left when you hold dead nuts center. Then you aim at a bullet hole and now your 2 more inches off each way. Shooting with a release will improve consistancy also.