I keep an eye on my K/D, but I am not willing to fly conservatively enough to make it really better then 1.8/1.9. People with 2.5 and higher make me suspicious.
Fly fast planes and don't get caught.
Or don't fly into hordes.
Majority of my kills comes from 38J and K4. Relatively fast and can handle themselves in a turn fight. You just have to be careful around hordes.
All of my deaths so far in this tour was from being stupid and going into hordes and trying to get as many kills as I can.