Update:
Finally seen some significant changes today and this evening after having the Scrubber offline.
Max pH was 8.2.
Even though I backed the alk dosing off by 20mL yesterday, it still tested 10.02 today. Calc was still 450. So, I backed of 40 mL of each. That puts my alk at 290mL & Calc at 400mL. Mg was up to 1380. So, it looks like I’m headed in the direction I was expecting, finally.