Just want to say thanks to everyone for all the suggestions.
I might try raising the humidity some to lower the VPD. That is pretty easy for me to control and i don't think the other plants will mind the decrease in transpiration seeing that it is a little high right now anyways.
Also regarding your epsom salt suggestion Jimmip, Is this because you think there is a Mag/sulfer deficiency? Or is there another reason for using epsome salt?
Well it cant hurt, lol. But realistically because it can facilitate better uptake of phosphorus and potassium in already stressed plants. It helps with (as I am sure you have read by now) a whole heap of things and at the recommended dose really cant do anything harmful.
A friend of mine has also experienced these same symptoms lately. And he didn't yet have the ability to adjust the humidity (he does now). I gave him the same suggestion and it was night and day.
Anyway, it might help and it won't hurt anything to try.
In the end your plant doesn't look that bad.
You did mention something that has me thinking that its really not much to worry about though.
You said the mother was exhibiting the same symptoms and growing at a similar rate to other un-symptomatic plants around her. That being acknowledged, there are different strains more prone to display clawing than most others. And they can do just fine with it. I would adjust humidity a bit, apply a dose of epsom to the soil and one in a foliar spray and let it roll for a few days. Or just pick one of the two, (for me that would be the epsom) and go from there. Either way they are your plants and the final actions are up to you. I hope all goes well friend. Good luck.