Coco has a slight edge. Not worth a pic yet.

Watered once with proper nutes, etc. Found Weezard's pH advice to be accurate:

Me: "I know this coco is nicely acidic."

Weezard: "Not really.
Peat is acidic, coco is almost neutral.
Brings almost nothing to the party.
So, until you mix in the nutes and run it through the coco, your PH tester will be tellin' lies about acidity."
I watered to runoff with water @~6.1 pH, tds~1000ppm.

The runoff measured pH 6.0, tds ~1400, so despite the results of my pot-fulla-peat-runoff experiment, with a plant living in there the pH is solid in the coco.

We're about to water with plain pH'ed H2O. This'll only be the second watering since the transplant, so maybe the coco will start to take off better now that there's some roots in the "zone." All the plants look good, considering the low light.