The finished this in first place with 258 points, about 12 points above of the second place finisher. I used the 2nd and 3rd most difficult jumps (Back Full-Double Full-Full 4.425 and the Back Double Full-Full-Full 4.525).
Get as many points as possible on the easy portions; Push off, ramp launch and landing. The most difficult part is the style section, which can be disorienting if you're not ready for it.
The easiest way for me to approach this was to separate the sticks. The right stick will be for the outside green bar, while the left stick will be for the inside blue bar. Both jumps listed below will have the respective R and L icons on opposite sides of each other the entire time. The only thing you need to watch is the speed in which they move, which can go from slow to fast and back.
After a run or two you should have a handle on this and grab the 15g.