You're probably drawing about 50# at your draw length. Personally, I like my arrows about an inch longer than my draw length, and i tune with point weight. But some folks like their arrows longer and tune by shortening the arrow in small increments. If you like shorter arrows, cut one 600 to 26 inches and see how it goes. With a hundred grain insert and a point and adaptor of another 150 grains or so, you should be in the ballpark. The 500s may be too stiff at that length. But they might work at a longer length.
Maybe others will chime in with some combos that work for them. Otherwise, you're just going to have to do a lot of experimenting. Good luck.