i found this user by the name of "MULLINS" on youtube and they do fastest lap speedruns, (to my knowledge) they haven't submitted any of them but he has found some great techniques and skips for tracks, i will link them here:

at 0:16

and 0:25

Well he can't submit them that's the thing. He uses 2x nitro, and we use normal settings. Some skips do seem very useful and when my freaking Derby Class speedrun uploads I'll start experimenting with single tracks :)