also, if you find that this setup is close, but a tiny bit stiff, don't go cutting your arrows and messing with point weight. I simply stuck a 1/16" piece of felt on my strike plate, and now everything is dead center.
examine whether your shelf is cut-to-center, not quite, or just over, and a small adjustment there can save you a ton of tuning headache. I started out using Stu's calculator, but ended up with a good bit stiffer setup than it recommended. you can't argue with good arrow flight, though. if it works, stick with it.