Ok,well you are massively overfeeding them mate so no feed for at least a week and then feed at about 1/4 strength and monitor their progress.
As for the mites,well,spraying with pyrethrins on flowering plants is not best practice as it can impart a really shitty taste and depending on the sprays strength may actually kill your pistils and once that happens the calyx stops producing resin so its counter productive.
Pyrethins are used on vegetables that are washed before consumption and as you can't wash your bud,well,you get the picture?
About the only spray on the market which is benign enough to use in flowering is something called SB Plant Invigorator.Its a plant tonic and foliar feed that greatly suppresses( but not eradicates)the borg and is organic as well.
You can do a chemical fogging by using(I know,I know it sounds awful!)Bob Martins Flea foggers which you get from pet shops.
Just place a canister high up in your grow,hit the button and get out and let the fogger fill the grow and kill the bugs.Very handy when you have many plants as its such a hassle to spray loads of them.
The stuff breaks down in sunlight and is used in domestic premises without ventilation so isnt a bio hazard if used properly,done weekly.
If you are gonna spray,never do it under the lights as water droplets can act as prisms and burn the plants really quite badly so after spraying always leave for at least an hour to dry before placing back under lights.