Nope, I don't shoot trap. I would hate to find out that two hobbies were conflicting with each other though.
I think you touched on something here. I was shooting this weekend and paid attention to my thumb (as per the above posts), but I would still usually pull left. I think my problem has been a combo of bad habits that I have let slide for too long. I'm going to put down the centerfires for a while and stick with the .22 for a while to see if I can't straighten this out.
Thanks for all the input guys!