I have a bike with the Vittoria Corsa Control tires, another bike with the TB14 rims, and a third bike with Sanshin-made Specialized hubs (probably furthest from equivalent to the OP's magic ingredients). I can see how together they would make for an exemplary ride. My suspicion is that the tires are the most significant contributor. I've got them on a PX-10 with Mavic Module E rims and Normandy Sport hubs, and the bike positively floats. The TB14s are probably the best looking modern rim for vintage builds. I think they're slightly stiffer feeling than some of my other rims, but with the right tire that won't matter.

A point of clarification, [MENTION=515292]Albion[/MENTION], are you saying that the black plate on the TB14s comes off to reveal a Schrader-sized hole, or did you have it drilled?