If you want to get rid of the oat, you have to think of the throwing motion more of a punch with a wrist flick then a swing from a tennis racket. If you look at Jeremy Koling, one of the best forehand players in the world, youll see he keeps his elbow extremely close to his body until the end of the punching motion. Its just a punch with the rest of the power coming from the wrist flick forward. Im a forehand player and use the d3 just like Jeremy and i can consistantly hit 375-400 accurately on the course with it on the course. However this is primarily for understable discs. If it is a overstable disc, then oat wont affect you disc as much because the disc will already wamt to come back due to the natural flight. Hope this helps.
Well it helped me! I have been wanting to get my short range FH to work, and I just tried this throwing at the couch and it seemed to give me a big improvement.