Need to get in at the flag, for the full bar, then hit up again at the launch of the ramp. Fill both of those, keep your nose at a good angle up and go flat on the way down, I managed to get 759. No groupies or tricks everything else maxed.
Managed to get stuck, and my save game takes me to the exact same place, on an industrial level, facing an opponent that looks like Cyborg from the Teen Titans. Really don't want to start over, if possible. Walked over to him to start the fight, now I can't move away from where I am standing.