Depends on your draw and arrow length.
If you're shooting 30-31" arrows, you can probably go to a 7595 with heavy points (since the arrows are so light).
I shoot a 60# Hunter primarily, and I've tried every GT setup imaginable. With a 29.5" draw, the only thing that bareshafts perfectly is a 30.75" GT Trad (.300 spine--black ones are .340) with 200gr point and standard insert. It was quite a surprise--I never thought I'd need .300 spine for a 60# bow. Point is, a couple inches of arrow length, coupled with heavy points, can put you into a spine category higher than you might assume.
If your bow is like many other Martins (or at least the three I have), it might be a few pounds heavier than marked. If you pull all 28", you might be pulling 60#, and more if you have a longer draw. I'd recommend you try a couple arrows before you buy a dozen. Definitely bareshaft them if you can.