Wow – sorry for the wall of text last night!
since my Genesis seems to be really bright and I need to turn the brightness down to 40, which is too dark on all other consoles. Isn’t it better to adjust R/Pr / G/Y / B/Pb offset and keep the TV at 45
Yeah that sounds like a good plan – don’t think it’ll cull information, and the Genesis doesn’t have a massive range of colours/tones anyway – you could always use 240p test suite (if you have an everdrive or cheap flashcart) to make sure everything looks OK with the new settings. Also easier to save those settings to a specific OSSC profile rather than having to change brightness on the TV every time! 🙂