Quite right.

Jeff you've probably shopped around and checked out some custom made longbows and recurves.... and you'll frequently see an option for tillering a bow for a shooter who shoots three under vs split finger.... that has to do with where the center of the bow is vs where the arrow is placed and where the bow is drawn from. Its like a see-saw with unequal sides or a unequally weighted riders. You can tiller a bow to pull equally... and you'll notice your draw becomes much much smoother, despite only a 1/4# drop in draw weight.... it will often shoot a lot better too (thats the point of course).

As Bruce mentioned too... top and bottom limbs (and left and right halves on split limb bows) are often not exactly of the same deflection... in fact on most split limb bows I have had to reconstruct.... they are different.