Doser

I am new to the doser world and have a Jebao Dp-4 auto doser that I need to set up. My question is with a 100g tank plus 20 gal sump mixed reef what should my starting numbers be? Right now I have brightwell aquatics solutions that I need to finish out but then I will more than likely switch to bulk reef supply stuff.
My params as of today are:
Alk 8.4
Cal 370 I am slowly getting this one up thinking maybe 420-430 range?
Mag 1400

I did a 15 gallon water change a few days ago so it put my mag and alk up higher than the cal

I tested daily to see what the tank was using up. Example Monday calc 440 Tuesday calc 435 Wednesday calc 430. Yes, I'm really simplifying this but the tank is using 5 ppm per day without dosing or water changes. I use the reef calculator on BRS to change from ppm to ml which tells me based on water volume what I need to dose daily. I would keep checking levels and with little tweaks you will be set in 2 to 4 weeks. I also use the jabeo dp4 and love it. I actually dose 4 to 8 times a day to reduce swings in levels. If you need any help I'm more than happy to help.

Dennis 435.890.6626