Scott your tank and basement look great. The problem with new tanks is your chemistry demand is always changing until it becomes more established with a healthy number of corals. Then demand becomes more stable and you can dial things in and maintain levels without constant adjustment. Until then it's test and adjust at least a few times a week. I found this to be particular frustrating when I ran a 3 stage dosing system myself, three separate parts to test and adjust several times a week was just a pain, Ca in particular is hard enough just to test consistently. This is why I switched back to a Ca reactor, I just test Alk and maintain that assuming the rest remains balanced which for the majority of the time is exactly the case.
In regards to your Mag, I'm not sure why you would want levels above 1300, I'd say anything above 1200 is ideal. As far as the alk jump, that's pretty typical after upping the dosage, sometimes it takes a bit for the adjustment to register. It might take a while to come down what that size tank and little stock so don't be too quick to adjust, if it remains stable you're probably at the right dosage. Also upping Ca can help decrease Alk levels.
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