That's nitrogen toxicity from too much nitrogen.
You could see it starting earlier in veg in your diary. You made mention of the clawing leaves then, but didnt notice or at least mention the dark colors in the leaves. You thought maybe from the light. Ususally too much light will also lighten the leaves on top and may twist or bend to not take up so much light.
Dark hunter green color with clawing in the leaves om tips are your indicators for nitrogen toxicity. Back off the nitrogen for a while and monitor her. She will work herself out but gonna take some time.
Best of luck, Happy Growing!