RT, Perhaps the wood was a little wet, that can chrysal the toughest woods..Trust me
Floor tillering gives you the hands on feel of the wood/stave from the start. You can quickly look down both limbs and see if they are bending the same or what adjustments need to be made.
As your skills develop you can tiller farther along this way if you wish, and while I have a nice tiller set-up I only use it for an occasional check or for the 73"+ 80+# bows since anything shorter I can usually get shooting by floor tillering past stringing distance and by looking down the limbs of the strung bow while pushing out the string with the other hand.
Rich