I think N-deficiency is a good call. The compost could be the culprit, as not all compost are alike.
I don't think blood meal tea would be a good choice for indoor use. A weak solution may work but it is a "hot" nitrogen. Easy does it.
Perhaps unrelated but, vermiculite and peat both tend to hold water. There could be an aeration issue afoot, but maybe that mix has worked for you. I would have swapped the the vermiculite for perilte.
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