Just found the journal. Have you looked at this page?
Plant Abuse Chart I have it book marked. I also keep a copy of Cervantes' Grower's Bible on my desk.
First, I am not a fan of rock wool cubes. I had several issues when using them. All of those problems went away when I switched to Root Riot cube for seeds an coco coir/perlite for moms.
I don't think adding diamond nectar this early is needed. let them get a few more leaves going before you start loading them up with extras they don't need yet.
Looks like you may have a bit of an Mg def going on. Do you know the PPM of your mix? Espom salts, 2 tea-spoons per gallon should take care of the Mg def.
Also the raised ridges on your leaves may be a sign of salt build up. Are you feeding every watering? You also mention you're squeezing excess moisture out of the cubes?
If these werre mine, and I was going to make moms out of them, I would have them in my media of choice for moms, in a small pot (1 liter coco/perlite hempy) and then feed them every 3rd watering, which is about every 7~9 days for me. once they start to get bigger, transplant to a larger container and then consider using something like OC+ to grow them with. You want moms, not monster bushes. You want moms to be healthy, fairly bushy and short.
Once you get them about 6~8 inches tall consider the bonsai mom method ( do a quick search in the forums).
The best tool you have at your disposal is the "How To" forums. Tons of information there. I read constantly for two months before I cracked my first seeds, and still f'ed them up. Read some more and now 100%.
Best of luck on the girls.