Thanks Pokey. You phrased it better than I did I think. But, I am moving the crank ( Edco Competion ) and BB (Edco) to the Miyata, so I will not face imcompatabilty issues between the crank and the BB-they came together. The BB comes out of the Italian BB shell (70 mm) into the Miyata (68 mm) shell. The main unit of the cartridge is 67 mm, so I don't think there is any problem there. But I can't tighten up until I get the English threaded cups to work with the cartridge.
There is a huge weight differential between the crank sets, and also some between the BB cartridge plus cups, and the cup and cone system. I guess I want to see what effect this will have on the tourer to make it more enjoyable to spin fixed. If it works I will get a new BB for the Concorde, and new crank set.
I am not ready to admit that either of the bikes are deficient until I work on the drive train and wheels on both. If they still flex too much under stress, I will entertain the thought that "It is the bike" after all.