think it is extremely important to know how to throw all different types of shots because you never know when you’ll need them. To change things up and to work on this certain shot, I would suggest trying to play a whole round doing that shot (I don’t recommend doing a whole overhand round, or something that may cause some serious injury). For example, I really worked on my upshots by playing a whole round with my Roc and Aviar. This forced me to use these discs on every shot and helped me figure out how far I could actually throw the disc. So I would suggest maybe trying out a new throw or disc and teaching you a “new trick”.
Hope that helps, and you can re-invent your game for 2012!