OK I tried the Showers Pass Double Century. AWESOME orange color, lightweight, and pretty packable. Also made in China.
And not quite as form fitting in the body as I hoped -- I really don't want it to flap. They had something like 5 men's smalls and larges, but no mediums, so couldn't try that.
I'm starting to consider others that have some other underarm venting but maybe not pit zips. Aarg. Still looking...
Sit bones = ~135 mm, saddles that work ~ 155cm/6.1 in wide
2003 da Vinci (custom road/all-rounder)/Terry Butterfly Ti
1994 Gary Fisher Nirvana (vintage MTB/commuter)/Terry Butterfly Chromoly
1991 Terry Symmetry (NOS frame/fork, project in progress)
1973 Raleigh Super Course (project in progress)