I came to the conclusion a few years ago that the less you have to pull a bow during tillering, the better the outcome. I start by making the thickness taper of each limb as perfect as I can by feel and floor tillering. When I'm satisfied that I've tapered the limbs as good as I can using that technique, the bow is usually ready for the short string. If there is a problem, it will be revealed by the braced bow - there is no need to pull it further. I'll make the brace as perfect as I can and then it is usually a simple matter of removing wood evenly from both limbs to achieve final weight using Steve's no set tiller technique. My tree is used sparingly in this process.
It's interesting that Steve has come to prefer a parallel limb design with most of the taper occurring in the last 12 inches of the limbs. I came to a similar conclusion as that was the design that I seemed to consistently get the best results from.
Good discussion Steve!