I'm curious about your BB setup on the Open also. I'm running the SiSL2 cranks on my Funk with a 73mm BSA shell, BSA 30 bearings, and the lipless 132mm spindle that DrCannondale (among others) sells. Mine is XX1 (leonardi spider), and the chainline is dead-on what I think SRAM recomment (49mm), and the cranks centered perfectly on the frame... With a 122mm spindle aren't you 5mm too low on your chainline compared to what Cannondale intended...?
No idea what spindle would be on the Open, but the 122mm spindle mentioned earlier in the thread was in reference to the Seven IMX. The big ring is totally flat so moving the chainline in is not a bad thing in that case.