I just mustered all my Google-Fu to try and find it, and I think I just did: not actually a spreadsheet, and a little outdated (“Last edited: May 31, 2018” and only covering eg firmware up to v1.15-alpha), but otherwise seems to be what you described: SkyRC — IFA 2014 — MC3000 charger-analyzer | Candle Power Flashlight Forum
Was that it?
If so, what a shame it isn’t being updated anymore 
the post author seems to be still active in CPF, but his last post to that thread was in 2020… :-/