"(44 ppm out of tap)"

Hmmm, we should have asked about that.

You have soft water.
That makes me wonder if PP nailed it?

I used Dynagrow for a DWC run and found it lacking in Cal/Mag.
My water runs 120ppm. but it's from Lava wells so almost none of that is Calcium.
Seems like Dynagrow is formulated for tap water that already has some calcium in it.
Added a tsp of Cal/Mag per 5 gallons and resolved my issue.

This far into flower, extra nitrogen is undesirable, so be sure to get the Cal/Mag without nitrogen.

@TL. Nope, hardly ever.

Aloha,
Weeze