Please help me save them!!!!!

My setup is the following: 3 plants in stealth closet grow. Currently vegging 18/6 under a 250w electronic ballast metal halide lamp. Plants are grown organically in Fox Farms Ocean Forest & feeding on Fox Farms Grow Big & Big Bloom (on the fox farms feed schedule). Currently on week 6 today. I was recently paranoid that I may be overfeeding them so I have recently been watering w/ fertilizer.

Plant was recently infested with Spider Mites. Just purchased Docktor Doom's Spidermite Spray and treated plant with it last night. Noticed this evening (after 6 hrs off) the plant looks terrible. I am hoping one of your guys will be able to help me save these babies. The room temp is around 80 degrees w/ 40% humidity. Lights are ~12 inches from plants. I tested the PH which showed about 6.8-6.9. I am using a moisture meter to determine when to water (usually about 1x/week). Any suggestions or are these to far gone to repair? Thanks!!!

flush them....3:1...water soil ratio
only use water to feed
when u see new growth looking regular
start with 1/4 strength nutes and go from there

Alright, I went ahead and flushed as directed. Is there anything else I need to do? The leaves are starting to become shriveled...should I expect their color to return to normal and the leaves to heal?

through away that moisture meter , water when they need it

Dude your making the mistake so many people make. Your feeding them to many nutes. Do like dude says and flush then nothing but water. If from your tap let it sit out for 24 hours to rid the chlorine. Plants need very little nutes in the 1st 2 weeks. After that just mild nutes and let the plant grow to its own full potential. The only time you might ratchet up the nutes is 4 weeks before harvest and no nutes at all the last 2 or 3 weeks before yanking. How big are your pots it looks like to me if i was you I would buy some cheap 8 gallon brown trash cans at walmart, drill sum holes in the bottom and transplant them. When you give roots room to grow you can be assured your plant will do the same.

I already flushed them with tap water, normally I give them distilled water though. I read so many forums where people said use the Fox Farms schedule, but I guess they do start the nutes fairly early. I have been working them up to full strength, but I did start them off at 1/4 strength. I will go ahead and cease all nutes. They are in 5 gal buckets each, with holes drilled in the bottom. There is also sphagnum moss and a little dolomite lime mixed in with each pot.

Plants are still continuing to wilt...Is this just a waiting game or perhaps should I be doing something else to mend the situation? Anyone, please?

it looks to me like a nutrient deficiency or lockout. also looks over watered. where are the pros at? what soil are you using? this is the guide i use

https://www.rollitup.org/marijuana-plant-problems/157345-have-plant-problem-check-here.html

I would also try to bring PH down