Wanted to give an update to anyone that is interested in the progress of the tank:
I have been trying to keep my hands out of the tank as much as possible, and have continued to change filter socks every other day, and have continued changing 15 gallons of water every Saturday (10%).
NO3 levels have continued to sit somewhere between 50-100. I did test my RO/DI water directly from the unit, from the reservoir, and from my mixing container and got undetectable NO3 down the line, but did completely clean both of my storage containers out anyway. Also changed out all my filters and DI stages (always had zero TDS but wanted to be sure).
One odd thing: I had been dosing 4 drops of KZ Sponge Power since the beginning, mostly because I have so many filter feeders in the tank, and reasoned that keeping these sponges alive was a good thing as sponges=filtering. Decided to stop dosing for a week to make sure that wasn't my issue. Not sure how much of this is coincidental, or unrelated, but my PO4 dropped from 0.07 down to 0.03 but I also had quite a bloom of diatom algae, and the first appearance of GHA. So, wondering if stopping the Sponge Power actually allowed the algae to gain a foothold and in turn "use up" the PO4 in the water causing the levels to fall? Either way, I have started to dose the Sponge Power again, dosing 3 drops each night after lights out, which is a 50% dose, if for no other reason to keep feeding the filter feeders in the tank.
Really happy with the Kalk reactor setup. I am dosing 600ml of RO/DI water from my top off reservoir through the reactor every 24 hours and my alk has solid at 9.0dkh.
Have had issues with two of the corals in the tank, not because of issues with chemistry, but will various expected hitchhiker from the live rock. Check the tank with a flashlight every night and have pulled out a fair number of Gorilla Crabs, and a Red Mithrax crab that I caught eating my Acan frag. The other SPS (Montis and a Bird's Nest) are still going strong - colored nicely and growing strong, which still makes no sense with my nutrient levels being so high.
Thanks again to everyone that has read this thread and responded. Guarantee I would have caved and been dosing 10 different carbon dosing products by now, and made a HUGE mess of things if it wasn't for everyone's advice and encouragement.