Thanks, this really helps!

Thanks!

its a weird formulation/translation in general as youll see on a few other terms down the line.
Mass effects the bounce behaviour when you hit another racer:
If your mass is higher, theyll bounce away, if theirs is youll be the one pushed back.

and also, the wiki explains quite a few unmentioned things in there rather well: https://gensou-skydrift.fandom.com/wiki/Stats

the "MASS" modifier isnt very clear, " Weight. The higher you are, the more you won't defeat the melee." what the hell defeating the melee even means?