Are you sure you used Spectacide brand No Pest Strip? And did you read my threads about how to use the strips? You can't have a lot of ventilation, just like with bombing, you'll want to turn your ventilation off at night for 3 or 4 nights and your problem will be solved. Promise. Unless perhaps you don't have a door on your setup. In that case I would hang a blanket over the open space, turn off the ventilation for even just one night, and you should see them dieing. Use for one week to be completely sure. I am mite free now, as many people are who have used the strips.

Neem oil solutions will make them angry and knock them back a little. You could keep doing this until harvest, then scrub your grow room with bleach. I would not cut off any leaves. Your plants need those for sugar production and stuff.

Ah, hell. Read these:

http://boards.cannabis.com/hydroponi...der-mites.html
http://boards.cannabis.com/indoor-gr...der-mites.html