Also found that when you do the spiral,,, if you do it so the feather curls forward it'll slow the arrow faster. (sometimes good / sometimes not)
Either way, they sound cool in flight. Like a flock of grouse taking to wing.
Wetting the base of the feather and breaking it over a rather sharp corner first makes it a lot easier to work with too.
If they seem to slow you down too fast, just trim as needed on the height.
I used all the junk shafts I could fine for mine. Spine match didn't seem overly important. Probably because all that fletch made it run true pretty quick out of the chute (?).
That and being 10 yds. and (well) under in range for shots.