Unfortunately, I can't tell you if spider mites actually eat trichs or reduce potency other than the normal stress they cause and the likely reduction in plant productivity. If you have mites very late in harvest and can not use a high strength spray then there are three tips that I know to work. Keep it cold, like below 65 if you can. Increase the fans, blowing air up under the canopy to disrupt the little buggers. Buy a small paint brush and some neem oil, and paint the stalks. That way the leaves and buds stay clean from the neem, but the mites travel up and down the stems and stalk. The neem has several ways of disrupting a bugs breeding and digestive systems as I understand it, but its also super sticky and helps trap those little buggers dead. Its purpose at this stage is essentially to act as a sticky trap more than anything else. I hope this helps bud, best of luck with the harvest!