you sure it was mites and not round springtails?
what color are the pests in question?
where do you see the biggest population?
if they are mites, i know how it is, i had a huge infestation of red spider mites awhile ago, i nuked em with repeated treatments of orthenex and neem oil, yeah i pretty much nuked the little bugs....
the double doses of the two, plus treatment every 4 days or so took a bit of a toll on a few of my plants, made em kinda mad for a couple weeks until new growth started, then it was back to healthy full growth....
did the same thing with thrips not too long ago, sarras pitchers looked rather ragged, but new healthy ones have grown to replace them....
freakin thrips/mites/scale....ive dealt with all 3 this year ;\