So it's been a few months using my new ESV Salt so I thought I would chime in with what I have been doing.
First off, I started using Bio-pellets in my tank so I have dropped my ALK down a bit for it. Currently, I am trying to stay at an ALK level of between 8 and 8.5 max with daily manual dosing. With that said, I also found my Mag was very low (1280) from my previous salt (Red Sea Coral Pro) so I also compensated a bit on that as well.
So far this has worked well for me for exactly 5g@1.0264 420-440 CA / 8.3-8.4 ALK / 1440-1480 MAG
Sodium Chloride - 1 1/2cups + 2 Tablespoons
Magnesium Sulfate - 1/2cup + 2 Tablespoons
Part A - 189ml
Part B - 95ml