Slimbob, I'm fine with the way you referenced the Yumi, because you attributed some of its ability to balance to its design. It would be interesting to see someone try to tiller a straight limbed bow, with one limb twice the length of the other, into dynamic balance.
Morgan, positive tiller only means that at brace, the measurement from the top limb's fadeout to the string is greater than the measurement from the bottom fadeout to the string. Keep in mind, that since a wooden bow's limbs often have differences in their unstrung profiles, the general profile described as 'positive' or any accompanying measurements don't necessarily mean that the bow will be balanced at full draw, or even that the top limb is weaker.
Guys, I realize there's more than one way to design and tiller a bow, but sometimes the combination of designs, measurements, and methods advocated can make it more difficult, and it appears by some of the full draw photos and comments that follow, here and elsewhere, that balance isn't always achieved, recognized, or valued. Some of this stuff is subjective I suppose, but...