ar4000

Ok, I got an 82nd a couple of weeks ago and since then I have been looking for the right arrow to shoot. I am Left-Handed and shoot 28" draw, 71 lbs, 27.5" arrow, off a ripcord rest. I had started to like the old Carbon Express CX400 with 85 gr. tip (368 gr.). I also wanted to try the CXL2 350 100gr. tip (387 gr.) as it was rated as optimum spine in my Archer's Advantage software. Anyway, I got the CXL's done today and when I shot them they hit about 5" to the left of where the CX400's hit. My question is...if the software says both are optimum spine why is it so far off? Center shot is good. Torque has never been a problem for me--even with low brace height...but who knows...


Thanks,

Don