From what I have read here my guess is the 2315 is on the stiff side. I shoot a
Mathews Ultra Max, 6 1/8 inch brace height, 65 lb. draw weight, 2314 28 1/4 inches
with a 100 gr. tip, or a 85 gr. thunderhead, 28 1/2 inch draw. Honestly, going
to a light carbon arrow with a mechanical broadhead is asking for trouble unless
you use weight tubes. I like to keep my total arrow weight above 450 grains or
better yet closer to 500 grains for better penetration. Try bowjackson.com to see
what the say you should be shooting. I used this for my set up and it was right on
the money spine wise.