Feuilles recourbées / problème de génétique ?

Nitrogen toxicity my friend. You need to drop your feed a bit. The clawing leaves is a tell tale sign of it.

mostly nitrogen toxicity, but excesive silica can cause similar look, but dark leaves and your list in diary makes me think you HEAVILY overfed. autos need less feed anyways, slow down, put them for 2, maybe 3 week on pure water diet, think salts buoild up, let them consume it. do not do any flush, this technique is for hydro or coco, NOT FOR SOIL. just stop all feeding, ph , dechlorinate water, have good wet/dry regime ( that gives oxygen to roots) and they will bounce back like nothing, if good tempos and humidity , plus no light burn, those leaves recover to normal look. i have think Fast Buds diaruy here , were i overdit it a bit ;) no feed brought them to good path. less is more ! golden rule of growing.

None of the edges are clawing upwards. Yes they're down. But if was true hard-core N tox. Id be seen clawing serated edges sticking upwards. This is light stress. I could be wrong.. just try a few things. Higher ur light..Lower its %. And you should see recovery. Also if it is N. Just cut all feeds and let the plant absorb some N from Lower leafs. Showing u ur plant now needs N Yes, N can show this also. But excess you'd defo c clawing. The drooping down is light stress imao.

Proper symptoms of Nitrogen excess.

clawing leaves is a symptom of over watering. I dont think its a ph or nutrient problem. though i would double check you are follwing the nutrients feed table to make sure everything is in order. Best of luck buddy hope it all works out for you :)

Ur in pre flower. Ur light intake is too much. Lower ur light to 700ppfd 45cm away. When pre flower is over (you'll know when it stops stretching upwards) then turn up the light. But tats light/heat stress from rays from ur light.