I can't keep up levels

[spawn]

Mg 1350 on Sat. after water change, today 1350
Ca 420 Same , today 400
Alk 9 dkh Same, today 8.4
New water is mixed to match paras
Ca is added 144 ml per day into 55gal NVW
Alk is @ 138 because I switch between 2 types of salt & alk stays higher because 1 of them is RC which has a slightly higher Dkh while they Ca tends to drop faster, but there are no signs of precipe & the sand bed is soft, there are visible signs of growth & I believe it is due to consumption I just wonder when it may level off. Which makes me wonder will this process be any easier with a Ca reactor. I know that it'll be less work & may cost less but I'm sick of checking it. I want to be one of those people who says " the last Time I checked it" especially with summer coming up, I want it dialed in.