Okay timeout for a minute here.
1 . You're doing automatic water changes correct?
2. Do you have things setup so that your ATO (top off) is turned off while's you're doing said water change?
According to what you posted Wednesday you had 35ppt water made up to mix and a tank at 33ppt. Then on Sunday your tank was down to 32ppt. This tells me me something isn't right here, be it your refractometer or whatever means you're using to measure salinity...etc.
Everything in our tanks is based off of a certain salinity level. Say you choose to go with 35ppt. All of the numbers you test for are going to test out at different concentrations if you're not maintaining a stable salinity.
Example for clarity. Say last Sunday you were at 35 PPT, Wednesday at 35 and this Sunday 35. If you read 1350 Mg then 1320 then 1300 I would believe that.
However, because your salinity is dancing all over the place it's going to throw the ratios off in your testing. I don't know what salt you're using as it is irrelevant so I just picked one. Here is a picture of the ratios of elements of Red Sea Blue Bucket according to the website/bucket
My overall point is, if you can't get a stable salinity throughout the week, testing and adjusting isn't going to do you a whole lot of good as your numbers are ever going to be evolving and changing because of the change in salinity.