I don't think the actual brand of salt really matters. Instant ocean has been around forever without changing its recipe (despite the knowledge boom over the last 10 years) and people swear by it. They key is to just be consistent. Like most reefers (like Spidey) I pick my mix based on how well it dissolves in the water. For me, Instant Ocean left a lot of residue which doesn't hurt anything but isn't as clean as I like it. I use Red Sea Coral Pro.
Are you worried that a WC is causing your params to jump around? You can test that by: 1) testing the tank water before the WC, 2) testing the tank water after the WC, 3) test your freshly mixed water, and 4) testing your new saltwater just before you do a WC.
I used to test my new mixed water params on occasion, and when I open a new bucket, but all I learned is that it really doesn't matter. There is no reason to think the values you pasted above are true or will be the same when you mix it up.