Check your release? Are you snap shooting? Sometimes when we want to shoot a certain way all the time we begin to overstress areas of form. Inconsistency that you speak of may be in your release? I wouldn't really know without standing next to you but it sounds like you're putting alot of pressure (mentally) on your shooting practice. Good form develops over time, relax and enjoy your shooting time?

Good luck
NFAA Archery Instructor

Sean P. McNierney
Berea, KY