Here is how I got to my current set up-- 65#- 28" draw length Carbon Spyder 34. Was shooting Flatline D.O.A.'s with regular inserts, 340 spine, 28" carbon to carbon length, 100 grain tip. Came in around 380 gr. Speed was in the upper 280's-290 fps. Decided to try a different arrow- went to Carbon Express Maxima Red- 350's - regular insert- flew like lawn darts and tuned fantastic-- came in around 404 gr. and flew around 280 fps. Then decided I wanted heavier up front, went with the Carbon EXpress Maxima Red SD- with the 45 gr. in/out insert. Stayed with the 350's and length. Flew better than the regular Maxima Reds, speed dropped to 270-275, but the arrow came in around 440 grains. Decided that the cost of the CE arrows were getting too much, went to Easton FMJ 6MM- got the 390 spine and put 50 gr brass insert in the front. Arrow came in at 450 grain, speed was in the upper 260's, but tuning was a real problem. This year I went to the 320 spine, with the regular insert for the FMJ- arrow is 460 and they tuned just as well as the CE. My f.o.c. isn't as high, but they fly great, group well. Yesterday I wasted one shooting a group at 40 yards. Figured with my aging eyes, my groups of tennis ball size would be ok. WRONG-- robin hooded one. Oh well, never did do well with 12 arrows. Only other change has been to add the RX-1- same poundage. I tuned both bows to the same arrow so if I have a major break down, there is no new in season tuning necessary. I want momentum over speed.