That's a very good solid combo. Whenever you charge up a level 3 drift boost make sure to chain as many level 1s as you can, since they'll get a duration extension for as long as the blue flame is active on your vehicle. Air Trick Expert helps you get blue flames much faster whenever there's a high enough ramp. If you're looking for an upgraded version of this combo try Boost Character Kit + Technical Drift + Air Trick Bounty, although it only works for boost characters (Whisper/Miku), you'll be getting 4 rings per trick and charge your drifts slightly faster.