[BigXX78]

The older versions of Easton charts came out when average IBO speeds were well below 320. Really, though, you could pick any of those you like. If it were me, I'd want 2315's. I shot them for years with several older bows.

 

[BigXX78]

That's and should be considered but probably small in the big picture. You definitely don't want to shoot an arrow that is borderline because of that but if you are well inside the spine rating you'll be fine. Also as many of us know there is nothing wrong with being over-spined a bit as well. So when in doubt just go a little stiffer.

But a 400 spine is 400 no matter what the material is made of so it depends on if you are using the charts to pick the spine or knowing what spine you want and getting that arrow.

Agreed. I was considering the OP's 27" DL. It would be harder for any of those shafts to be borderline weak.