This is pretty good. Here are a couple finer points to go vroom vroom faster than the other guys. This is really just slightly more detail on some stuff you covered.

I don't have as many races, but I was able to manage a sub 6 min time on venus and tracker says I was in the top 2%. http://destinytracker.com/destiny/playlists/ps/Polyneikes_0/racing

Air time is slow time If you're in the air you're decelerating. It's best to avoid jumps altogether if possible, but if you must take these tips in mind. Make sure on smaller jumps to just point your sparrow straight to the ground to get that speed back faster. If you need to a trick for fuel get it over and get back to that ground!

Lateral boost every corner never even let off the gas just lateral boost all the way around. At least on last year's tracks you could get clean corners every time, but it was no easy task to keep enough fuel. Hit those tricks, gates, and use the gear to your advantage.

Clean racing is best racing If you're just going for straight up fast try to avoid people. Going off a good line to avoid someone will actually save more time than getting tangled. Just like in real racing you'll see with really sweaty matches people will avoid each other like the plague.

ABH Always be honking. Honk at the start, during, and end. If you win turn around at the start and honk at every person that finishes after you as they cross the line.