On Blondie, I had similar stalling issues last week. Initially I thought it was bad fuel too. When I opened the gas tank there was a huge pressure differential, which I suspect was caused by riding through the Fraser Canyon where it was 38 degrees.
Our Kelowna friends put her on the 'puter and while the stalling was documented, no solution was found. Fresh gas and cooler weather seems to have fixed that issue. The technician also checked the vent hose on Blondie as a precaution, so you are on the right track, maybe.
Routledge is starting tomorrow morning, so will let you know what you missed