Update..
Ok.. Got some pics to show up from today.. First I'll type in some notes..
The soil girls as you will see are much much more advanced than the Coco-planted plants of the same. The soils look to be roughly 3X the size, as you'll see in the pics. I didn't use any nutes at all in the Coco at first because I'd always read that whole "You don't need any nutes for seedlings for the first couple weeks" belief.. While that may be true, my promix plants had 75% fresh peat+perlite, no nutes at all, and 25% guanto tea-drenched peat+perlite. The difference between the two is amazing. A week or so ago I threw in some lightly nuted water to the Coco and that kickstarted them a little bit. But my lesson learned here was, at least in my case, having a lightly nuted(is that a word?) medium seems to really increase the rate of growth out of the gate. The coco plants themselves, however, look just fine, they're just behind.
I also have another 4 girls, 3 in coco, 1 in promix that are a week or so behind but I didn't bother with pictures of them, they're just small seedlings.
I'll probably repot the promix girls into 1/2ish gal pots before next week. They're drying out completely pretty much every 24-36 hours at this stage.
One last note is, 4 days ago I was kind of surprised at how indica-leaning the babies in promix looked considering the parental lineage. But a few days later the leaves seem to be thinning out a little bit.
Oh yes, one more thing, the girls are EXTREMELY uniform in structre. They pretty much look identical between one another.