About a month ago I was using thunderheads and they were shooting great. Then all of a sudden it went bad and they were flying horrible. I went to the pro shop and they looked at my form and how I was shooting. I could shoot great from 10 and 20 yards but when I backed up to 30 my arrow would fly any which way. They tuned my bow and made sure everything was ok and gave me some Montec G-5's to use. They flew great and i've been shooting awsome and then yesterday at the deer lease I was shooting and same thing. Got back to 30 and they were flying every where. They were shooting pretty good from right to left but shooting way low. I put my 30 yard pin where my 40 yard pin would be and it was still shooting low. Guess I'll go to the pro shop today and see if they can fix it agian. What do ya'll think I'm doing?