I pick an arrow I want that is around my spine and work from there, most of my friends were shooting real heavy spined arrows for 3-D, until they saw me shooting light spined arrows and getting real good performance, now for 3-D they shoot light spined arrow too. When I get good arrow flight, I then check with a paper tune.
I am going to try bare shafting for the first time, I have some new 1535's on the way and will do it with them, then if I get that right I'll try it on my 3555's for hunting.