Hi Mike,
I'm going to ask to do one other measurement (or a series depending on how
involved you get).
Find a level spot for the bike. Use a plumb bob to find the point on the top
tube that is vertical over the bb, and mark the side of the tube with a
sharpie. Measure from there forward to the center of the headtube on each
bike and write it down. Presuming you have identical saddles on all your
bikes, place a drafting triangle on top of the top tube, at that mark and
measure back to the nose of the saddle. See how this works out with the
various bikes and check the stem length on each one vs, the forward reach of
the frame. I'm hoping this gives you even more good information than what you
have now.
Stevan Thomas
Alameda, CA