my best effort to sort this out --
1. stock firmware has just ONE bfo calibration to make, because CW and SSB are the same 'mode selection.' and its the same for LSB/USB because of the unique spectral flip in the RF chain
2. CEC firmware (I am not there yet ...) perhaps has more BFO calibration - because it has separate CW and SSB mode setting(?). I need to ask Dan about how split works in CEC - he didn't need that in the contest, but I sure 'had fun' using split to work some of the same stations after the contest.
just a few miles south of Dan BTW