Twas the CoCo that pulled your pH down. I read something about Superthrive that it's for vegging only not flowering.
. I've always used Promix and can't get it right now so I'm using potting soil or straight peat and haven't mixed enough perlite.
You make my head spin with all the stuff you're doing. Keep it up!!!
That's one thing I've noticed with the small SOG, you can run a series of 2 or 3 plants a week and do something different with them.
I'm wondering if your soil mix is a bit heavy and needs more perlite that's causing your lack of vigor. I'm having that problem with my grow right now. I've always used Promix and can't get it right now so I'm using potting soil or straight peat and haven't mixed enough perlite.