Cool, always a joy to see you guys play my games! :)
I think the AI rubberbanding needs some work, I think the "I'm constantly stuck in last place" situation is because the AI adapts to whichever player has the best position... maybe I should experiment a bit with having them adapt for the average player position or something, all of them trying to match whoever's in 1st place makes it kinda empty at the far back of the pack... Didn't really get to try out multiplayer a lot during development, since I don't have any friends ;w; (Mostly just set up 4 players using spare controllers to check the game didn't spontaneously combust, and then called it a day)
(You lose speed driving uphill and gain speed driving downhill, but I think you mostly saw the AI boost/slow down and not the effects of your actual speed change)