Rooke
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Once you get your temp and rh up you can put a small oscillating fan blowing above them to help strengthen the stems be careful to barely move the leaves
cheers mate ,I kinda doubt that's the case really, anything is possible I suppose, but coco should be fairly easy to flush.
TBH, I'm not seeing all that much malformation that's of any huge concern. In my opinion anyhow. I think your concerns should be noted, but not of tremendous significance at this point, the plants are still young, and it happens sometimes, they should grow out of it. A few wavy leaf margins, but nothing really extreme going on there. Probably has more to do with environmental factors, (temps) or genetics than anything.
If you concerned about the nute concentration, back them off a tad. That's always an option, and you can dial the light back a bit also, if you think it might be a bit on the intense side. Personally, I push them, but not too hard, especially at that stage. When I hit a road bump, I do tend to back things off to re-evaluate.
Some issues are simply difficult to nail down to any one thing. When that happens I'll generally back off a little, until things straighten itself out, then dial it back up.