Wow this looks like it took some serious labor. Some random things I noticed while skimming through this:
Split up littleman into 4 courses, then blue and red side as well (like skillsrank had). For blue side it's really easy as demo. Red side is def harder, there's that one level with moving platforms that's pretty tough for most people.
legion c1 for demo should be the easiest tier. As should most soldier maps. You have it as 2 right now.
Make what c2 6 for demo.
Make nbn c2 for demo 5. Maybe even 6. It's the 4th hardest demo map imo after scorpion, what, and over.
Idk about 5 for lanc... it's not that hard imo. The lanc bonuses are pretty tough. I would say 4 or 5 for b1, 6 for b2 and b3. I'm not sure how the tiers for bonuses work relative to tiers for courses. Considering a speedrun of a single level is pretty easy, if I'm supposed to rate bonuses on the same scale as courses, the bonuses should not be that high. Once again, I can't help but feel it's silly as hell to speedrun single levels.
over_beta should definitely be 6 considering most demo jumpers say it's the hardest demo map. It has no bonuses though Momiko said there would be. But considering it's been like over a year since the beta has been released idk.
You're really gonna add network? It's so bad...
rebound should be 5.
mouser could be a 3, but I'd leave it as 4 due to the strats (the ceiling tele glitch and bounce and other stuff).
remember should be 4 imo. Not that hard.
I might make the rnc hard course a tier higher. Don't really remember it that much but I remember it was kinda tough.
I'd make soar for demo a 3. There's only lvl 16 which is somewhat challenging, but still not that hard.
turnip bonus should be same as solly for demo if not lower since demo moves faster than sol. It's meant to be done without any projectiles used (aside from at the very beginning).
I think this is a good start, it doesn't have to be perfect yet. Just change it based on more play testing when people have better opinions about what's easier or harder.