As for fletching, I’m using 5″ feathers. As for the spine, after everyone I trust whom I talked to, 400. carbon seemed the best spine. It’s a 50 lbs @ 28″ Arrow flight isn’t really an issue at this point. My groups are pretty solid (with the exception of some “rebels” here and there) and that’s usually owards the end of a session when my forearm and fingers are weakening. I am still dabbling with rest options. Seems everything I try wears down faster than it should (or faster than I think it should). Eh, the great experiment continues. Once I tackle this, I will be a very happy shooter indeed.