The most important thing I found is having an arrow that flies correctly when bareshafting. That tends to be what dictates the length of my arrow, the tuning with the weight I want upfront. I draw 29, and as luck would have it whats working for me right now is a 32 inch arrow, which shoot perfect out of both my bows, a 57lb whip, and a 75lb border archery falcon.
I work on the principle that if it isnt broken, dont try to fix it.
I cut my finger once. it was as described, a broadhead sharpened on the back edge.