I don't know for sure what will work, but my morrison ILF with carbon foam longbow limbs that are 82# @ 29", with the plate set up for centershot, is well tuned for 30" GT Kinetic 200 arrows with 525 grains total weight up front. Based on that, I would say that these arrows would be much too stiff for your setup. I would say if you are cutting your arrows fairly short like shawn is recommending, then the 300 spine might well work for you. I guess you will be drawing something around 66-67#, and I wouldn't be surprised at all if 300 spine works for you. Good luck.