Hey you're not using CO2 right?
Get temps down in low 70s day/ 60s night for a while... mites don't like chilly... get on them with neem oil too in veg, spray daily so by the time they go in flower there's NO buggies on them and they have a protective shiny coat of bitter neem residue that the mites hate. You can keep using the stuff carefully up to about the 3rd week of flower and then you have to worry that the smell might get in the buds. Just my couple cents. Mites ick.