Coming along great Uncle R!
I love DWC. The pH action is definitely interesting using tap water - as I do. I have found that if I let the nutrient solution bubble overnight (or for at least 6+ hours) I can get the pH to stabilize around 5.8-6.0. Usually takes about one or two small adjustments once the plants in the bucket. I too noticed changes in nutes as well. I moved to Canna Aqua Flores for flower and that shit just settles the pH very quickly. Also, switched to AN pH Down. Way more concentrated than GH - have to use a dropper because it is so easy to wind up at 3.3 or some shit, ha ha. I am using House and Garden Aqua Flakes A+B in veg right now. Similar ability to settle pH I have found. I am seriously considering moving to Dutch Master Gold exclusively after the results I have gotten from their products.f
Not sure if you deal with any water temp issues but I have found that keeping the solution nice and aerated and adding Dutch Master Gold Zone + Orca root inoculant has virtually rid me of pythium issues which I seemed to struggle with every grow before. I seriously cannot plug Orca enough. Within 2 weeks of using it, huge results for my root situation.
Your ladies look so hot...they should blow up in flower and give you some huge, resin-dripping goodness. I am watching this one for sure!
Good luck and peace