Can't identify, wet spots turns nute burn like

Hello, i have one plant in 140X70X180cm box. my pot is huge, 50 gallons smart pot, 2 400w + cooltubes . i have good ventilation also.

i give 20 liters 1700 ec aerated nute solution to my plant in 2. week of flowering, after 3 days i see begining of nute burn and i gave 20 liters 200 ec aerated water

i had some spidermite problems before and i used lots of things on her, dish detergent + neem + hot pepper on her, i get rid of them while in first week of flowering.

i bought biobizz leaf coat for precaution and i used it 3 days after last flush.

in 3rd week of flowering:
i think i have serious problem and i cant identify it. maybe fungus or nute burn, did you ever experience this spots ??

could you check back and front faces of leaves?



Thanks...

added 500 ec new(b52, bigbud, budcandy), old(connesaur bloom a+b and bud faxtor x) nutrient water solution to my girl

Pics of pulled leaves are useless. Pic of the plant or your wasting time.

Easy to burn leaves with too much application of certain spider mite remedies, like anything with oil in it.

Also easy to burn with overfeeding, not sure which one is your issue.

i cut buds that cant reach to the light, and smoked... my favourite strain is now SLH CBD! waitin for harvest...