Age! I moved my reply over to your thread so as not to have to cross post.
Hi Agemon clawing like that (& dark green leaves) usually mean a nitrogen toxicity, to much nitrogen
The clawing looks to have stopped already as the very top growth seems fine. I would agree with Con and say that it was a nitrogen issue though how that happened, I can't say. Looks like a nice plant though.
Thank you all, I will keep my thumbs crossed, hope for the best and feed slowly. I'm not seeing hairs yet so hopefully some recovery time before the onset of flower.