@SeanR,
Hey Mate✌️
I'm no coco grower but to me it seems feeding twice a day a bit much. She do look like overwatered to me.
Also I would keep the temps below 27°C, don't think your damsels like it at this young stage.
RH seems ok, i would prefer 70%, but thats just subjective.
I wouldn't feed her any extra nutes until end of week 2, beginning 3.. your damsels don't need to get fed so often..
Hope this will help you a bit.
Good luck, cheerz...
OimRausch