The only thing I would add to this so far, is to take a class with a good instructor. Appleseed will only get you so far, and the ladder from there is way higher than most even know. A one or two day class with a high end PRS shooter is easily equal to wearing out a barrel or two of your own experimentation and practice. Spending a weekend with Andy Reinhardt or Brian Whalen or someone equivalent will be an explosive expansion of shooting understanding. It will also show you a lot of the drills they use to improve specific tasks. I learned more this last summer practicing for and shooting a team match with RJ Dussart than I had in 10 years of dabbling in PRS previously. I have taken classes from Ron Avery, Todd Jarrett, Matt Burrkett, Charlie Perez, and Kyle Lamb. Short of Matt's class, I made major advancements in my shooting from all of them.