Need help with BRS 2-part

[Reefgoat]

According to the Reef Calculator I need to add 5 times as much Calcium as Alkalinity. Do I ignore the 1:1 ratio until I get everything to the proper levels? It seems that is the case but I have no experience dosing and don't want to crash my tank. Should I simply add each chemical independently, adding no more than their maximum recommended daily dose until I reach the recommended levels, and then switch to 1:1 dosing?

I think I will add Magnesium according to my test results rather than add the whole pack as they instruct.