Well, I just changed to 70# limbs on my 07 synergy and was out shooting it after getting it all tuned. Cams are in sync, draw length is 29, I just haven't measured draw weight yet. I was out shooting and it is shooting great. Slapping arrows group after group. I decide to shoot a broadhead(at 20 yards) and it hits 3" to the left, height is good though. I try a different broadhead same result. This is telling me my spine is weak as I am a Lefty shooter. I try to move my rest and the distance doesn't change. I moved the rest a little more but still no change. I am shooting Carbon Express maxima hunters 350 at 28.5 inches. I checked with OT2 and it confirms that I am on the weak side by quite a bit. The spine OT2 is telling me I need is about a 280 spine. I have a few CX Mutiny 350 arrows that I could try to cut down in length to see if I get any improvement. Is there anything else I can do besides getting new arrows? I really don't want to turn down the poundage any either. Thanks for any insight and help.