Use extended corner boosts to reach the Spitfire wall. First boost requires a teammate standing west to catch you on the roof slope; corner boost normally, then stand and sprint on landing. Second boost is solo: center on the small roof, corner boost, stand up past the roof edge, and sprint forward (diagonal toward the pillar or straight ahead).
For this extended corner boost you need a second player to stand to the west of you to catch you on the slope of the roof, then just corner boost like normal. Once you hit the ground stand up and sprint. Should be very consistent with practice.
Second extended corner boost is solo and you just have to be centered on this small roof start a corner boost then stand up once you are just past the roof and sprint forward, I like to do it diagonally to the pillar but you can do it going straight forward as well. This part tends to be pretty hard for most people so good luck.
