I would transplant them, it's amazing what transplanting into fresh medium can do.
If you transplant, I would consider going to only soil or only coco, instead of a mix.
If you do soil, look at the NPK of it. Some could last only a couple weeks and others 4+ weeks.
If you go coco, feeding will need started immediately.
Watering practices are very important during this stage, be careful not to over water.