Here's a simple way to add some of your times in the records for Individual levels, without recording the race (what can be hard to do if you don't have a 3DS capture card). You just need to :

• record from when you finish the race, so we can see your time
• then press "retry" so we can see the circuit's name
• and finally just press start and show what booster you were using.

If you want to see what it looks like, here's one of my runs : https://www.speedrun.com/scr/run/me8dj48m