Easton guide says 390's, but you may need to go down to 340's if you're shooting a speed bow---they like a bit stiffer shaft. This selection in based on single or hard cam bow.
I'm shooting a Mathews HDII Conv. rest. My old arrows were set up at 26 1/4", but my draw lenght is now 27.5" with this bow, so they won't work. I tried them by just drawing one back and the field point was all the way back on the rest...not a comforting thought with a 100gr Slick Trick Mag...haha. So I figured I'd go up to at least 26 1/2" or possibly 26 3/4", but those sizes are listed on the Easton chart under the 27" shaft.
BTW...what's the G.P.I. on the 390s and 440s?
My other option is reg. A/C/Cs in probably a 3-49, or all carbon Eastons in a 400 spine. Any suggestions? I'd like to keep speed up as much as possible, but would also like to stay with Easton arrows...just a personal preference.