You're right. It is a light setup and I am wasting alot of the energy that my limbs produce. I used the formula in TJ Conrad's book and estimating 180fps, my bow with this setup is only 62% efficient. This would account for some of the noise although I tried several barce heights and settled on 8 1/8" as the best for arrow flight and noise. Do you think 180fps is realistic for a 21 yr old Howatt Hunter? I don't have access to a chronograph to check it.