Trad Lites spine out to 35/55, the heavies 55/75. I think its a great arrow.
I don't like a lot of arrow overhang from my shelf because of my split vision method of aiming. So for my 27" draw, I cut, like Terry said, from the front end the shaft down to 28.5".
I installed a 100 gr brass insert, 30 gr BHA then my 125 Zwickey and 160 Snuffer. I have minimum of 255 grns up front with the 125 heads and they fly great out to 60 yds. I use 5" parabolic feathers, shoot both RW and LW.
I shoot the Trad Lites from my Recurves, 57# Groves and 58# Kempf and 58# Bill Stewart. I always shot barrel tapered ash and liked the tapered shafts and these AD's, in my opinion are one of the finest carbon shafts out there.