I went c to b a few times before it stuck at b
Huge change huge.  At B often people have speed but poor racecraft/control,  plus low b to high b is a huge difference again.
Mid pack B is very tough to get used to racecraft wise very tough.
My first b race I was seriously like this is impossible,  almost didn’t want to try after that,  just kept plugging away...
I think a lot of that really formed up how I tend to race.
Are you on 
@Pigems or my friends list?
I’d share up a race replay or two showing the hug inside curb survival technique for Tsukuba lol.
I never see people run it the way I do,  maybe once or twice but it’s not common...