ORIGINAL: Voodoo
I believe what you may be talking about is preload, and is a function in all bow designs,those thathave more tend to be faster,and seem to pull harder...those with less seem to be slower, and pull easier.......even though each are the same poundage at the same final draw length.
Very well could be. That was kind of what I was leaning towards when mentioning the draw force curve. Scales are very unbiased.
What would be very interesting to do would be to have two bows with the exact same draw force curve. One of the bows with carbon on the back and belly and one all wood limbs and compare.