Just adding what worked for me.
Changed the boost button settings from "throttling down will deactivate boost" to just clicking the left analog stick again. I then used practice mode to try it out, I was able to hit drifts very consistently and easily this way.
Then I went to dogfight mode.
I used TIE interceptors and A wings since you can go so fast and get boost, you can do hit and run on dogfight snarls. The quick lock missile was much easier to setup.
TIES and Xwings are okay, but interceptors and Awings are usually very week and easy to kill. Id put a few shots in from 1000m if I could to knock them down and then fire a missile. Watching distance can let you time the drift. Boost after you fire and then hit the drift. Hopefully you get the kill. If not, rinse and repeat.
Esseles and Yavin were the best maps, then Dockyards, Sissubo and Galitan were the hardest since theres so much cover to evade locks and not enough room to boost a lot.
I kept track and I had what I thought were about 20ish drift kills before it popped, so its tough to know if it counted or not.
You will hear a woosh, and usually a voiceline from your pilot (at least the hotshot rebel when I was in the A wing) when in the drift. I was probably drifting a little late on my kills. Dont get sucked into turning dogfights. Hit and run, should be easy if youre moving fast (I also used the propulsion engine to up max speed).
You wont get a lot of kills focusing like this. But of you find a new, bad player that doesnt avoid well and flies straight lines FOCUS on them. Keep trying to find them and setup your scenario.
I had one match where I had 6-7 drift kill scenarios this way.