So I'm making 7 arrows to add to my 3 already finished and made a spine tester tonight to check em all... How in the heck are they so high spined?! One is a little under 5/16" at the nock and a tad bit over 3/8" at the point but spines at 63 pounds! All except 2 are in 55-65 pounds. The other 2 are 71 and 93. Kept em all at 29.5" but I'm not sure that's enough for my 52@27 bow.