Easton axis n-fused carbon arrows
 

Hi I'm shooting a diamond infinity edge with a 27 in draw length and draw weight is between 65 and 70lbs what arrow spin is best

I'm assuming you mean SPINE not spin. The 400's should work well with the Edge. I don't have the Axis on my arrow chart from Easton for some reason and can't seem to find one online.

If you actually meant spin as in what fletching type I.E. Straight, offset 1-2 degrees, or Helical, we would need to know what type of rest you use, finger or mechanical release, which broadhead (if this will be for hunting).

Thank you and yes I did mean spine I was thinking 400 spine but a text support from lancaster archery told me 340

Then listen to him. I've dealt with Lancaster Archery for over 20 years. They know their stuff. As I said, I couldn't find the Axis on my Easton Chart. If he said 340 then use a 340.