Most if not all of the settings have descriptions when you hover over them in game. These are probably already too descriptive as they talk about internal calculations and such.
The readme is indeed mostly only to stop github from nagging for a readme.
For the rest I don't know how useful it would be to add even more information as that information would need to dive deep into the algorithms to explain what is going on.
Aside from just copying the setting descriptions to the mod page I'm not sure what I should make more descriptive since for me everything is already clear. So if you have more specific questions or can guide me towards making things more clear for people who didn't write this mod I would appreciate it.