I just called and talked with Steve at Surewood tonight, and ended up ordering a test kit, started with 45-50#, and ordered an extra half dozen 60-65# and 65-70# with the 9 1/2" back taper to try out of my Northern Mist Baraga and Whisper. They both seem to like heavier shafts and am hoping with the back taper it will soften the spine a bit, I'm looking forward to getting them and playing with them. I sent close to an hour on the phone with them talking bows, and shafts. Really seem like great guys to do business with.