Plants seem to be doing a bit better at the moment, both showing signs of new growth so that's good. I think my problems came from them being in direct sunlight, too much too young, I think I might have cooked them a bit as the sunlight here is very strong.
Either way I decided to split the plants. The smaller and healthier of the two is still in the propagator, in the shade, and has not been watered since Thursday.
The other is now outside of the dome, again in the shade. Yesterday I gave it some nutes for the first time. I gave it a solution of 10% strength (compared to the bottle instructions), it had 10ml in total, just to see how it responds and if it picks up a little. Both look fine this morning, but still a bit droopy.