I missplit the final race. Actual time is 8:18.27

This run improves on Kacey's example of doing fewer tricks so you don't have to wait as long for the AI cars to finish. When you trick the other cars brake which can cause them to crash when they brake right before a jump.

I also tried the "go as fast as possible" strategy, and found that you can increase the trick counter quickly by wiggling your car instead of doing full rotations. I've reached a trick counter as high as 6, but usually this causes you to clip through the next jump and crash.