>>532673965
I only use Octavia when she comes up in Circuit but this works all the way to steel path level cap. I'm sure it could be better but whatever.
You pretty much just press 1-2-3-4 and then spam crouch until you turn invisible, and hang out while your ball rolls around trucking the entire map every time it gets hit.
Also, get a good song like this: https://www.youtube.com/watch?v=rVW0K369pQ4