as soon as i saw the first pics... i saw nute burn... the dark green twisty and crinkling leaves.... the second update they had died as you say and the new growth looks better. You then mention that you think you may be having nute burn, which you were... that was too soon for full strength nutes. The third update they are still struggling... but its hard to tell for sure exactly how they are doing 'cuz ur only showing the old growth in those pictures. The latest pics aren't as 'close-up'... but your new growth seems to be back on track, so that's good. Try to get another close up of the plant tops... if you could. The pots are small, so you are going to have to be vigilant about giving them exactly what they need, when they need it.