N toxicity?

Hi was looking for help on this.growing northern lights auto.last week the leaves around budsites have start drooping curling and clawing.is ghis n toxicity?i use a 18ltr fabric pot and water with 4 ltrs evrry 3 days.i feed half strength nutes once a week,molasses water once a week and then ph water once a week.i had the lights 30 cm away but have moved them to 40 cm now.i use biobizz allmix soil which is prefertilised.i ph watered last time and ph from runoff was 6.85 and ppm was 1250 which is quite high considering ppm of water with no nutes is 300.should i flush this plant or is something else.there is no yellowing of leaves on bottom canopy or burnt tips so very confused

it can also be overwatering

Looks to me like zinc def if affecting new growth

So plant is still growing fine,brought down the temp during the day slightly and i am keeping the light at 40 cm now,leaves are not as droopy or curling.fed a nute water on monday and have noticed these yellow marks showing up on the leafs at the top,would this be heat stress/burn or is it the beginning of a deficiency,any help would be welcome

I am not an expert but it doesn't seem like n toxicity. I had n toxicity recently and it causes clawing on all fan leaves with a little bit nute burn. Your leaves are just droppy and have some discoloring. About deficiencies/excess, I can recommend reading this: https://www.cannabisgrowingcanada.com/cannabis-nutrient-deficiency/ I generally observe the plant for a few days and try to find from this article. There may be signs of a couple of these but I focus of major symptoms (growth speed, bud formation, color of the leaves etc.). Also, it seems like there is interveinal chlorosis.