Boat pulling to the right

What makes a boat start pulling to the right? Thought it was the trim tab but after turning it as far as I can it only helped a little. The prop has a couple of very small nicks in it but I can't see that causing the pull. I hate to drop 150 bucks for a new prop and it not fix my problem. Anyone have any ideas on what to try?

could be torque but check the skeg, need make, model, yr, hull and engine

if its something new that it didn't do before, like said, check tha gear case good.... if its not something new its torque.. set up and torque tab is tha only answer...

Its a 2000 Duracraft semi V with a Yamaha F80 TLRY