Gotta get their hit as low as possible. For sure go 10 hs. Use that at the beginning of the fight. If they dodge all your cc (crowd control / stuns), try to run and regen until your stuns come back off of cooldown. Unfortunately birds are the best at kiting, and they are fairly strong at the moment. Thus, you are at a natural disadvantage. However, any class can work if you put time in. People told me fox was the worst class at endgame, and they are right. But I enjoy it, put time in, and make it work! I'm sure you can get it if you experiment.

Maybe a good way to improve vs kiters is to look at each fight as a chance to experiment and see what works. For instance, go into a fight not looking to win, but looking to figure out what does or doesn't work!

Hope this helps! <3
-Walie