I consider myself still fairly new in the qo100 community. One thing I don't understand are the RST reports, often it is a 59 or a 57 for SSB QSOs, but the best I can imagine for signal reporting is a signal to noise level that I see on the waterfall. For the speech quality I can indeed assign number between 1 to 5, but I don't do an absolute signal measurement at the antenna, there is still a downconverter there. I will just return a SNR from now on.
My proposal is to give the SNR of the station compared (and) to the SNR of the CW beacon.
It matters with the CW beacons what you measure since a SNR measurement is bandwidth dependent. So 2600 BW over both beacon carriers compatible to what you use in a SSB QSO?