RE: Carbon Express Arrows
Welcome to the forums!!
I would highly suspect the spine is the difference. At 70 #'s, unless you're shooting a short arrow, like 26"....you are underspined. The 350 is stiffer and the correct spine, allowing better transfer of energy to the arrow.
I wouldn't be surprised if the 350's are faster by a little bit.
I shoot the maxima hunter 350's.....incredible arrows.
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1995 Ford Ranger XL
Douglas Radial Tires
Super Blue headlights
Fiberglass front bumper
2400 pounds
14,229,600 #'s of KE
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