New to Dosing Ca, Mg and Alk...and would like some advice

[RPatsula]

Hi what I determined is that when you try to measure alkalinity calcium or magnesium… Your numbers can vary quite drastically from one day to another. It is also hard when you're depending on other people to help you do it. On April 26 I started dosing the BRS magnesium solution until I went through the 1 gallon jug . On April 29 I measured alkalinity at 7 D KH, calcium at 390 ppm, magnesium at 1400 ppm, specific gravity at 1.022 and pH 8.35. On May 1 I measured alkalinity at 5.6 D KH, calcium at 325 ppm, magnesium at 1290, specific gravity at 1.022 and pH at 8.4. I am going to measure again on Thursday night to see if there is considerable change again, or is what I am seeing normal. I am thinking that my magnesium levels can come up a bit, to 1350 , so I'm wondering would it be practical just to dose 1 L of magnesium over a two day period and then measure everything again. When should I start dosing the alkalinity and the calcium?
Thank you
Rick