You have CaC02 listed- I assume you mean CaCo3? If so, make a note to NEVER use it!
There are several reasons- one is that you almost never need to add alkalinity to a mash except in rare incidences. But the main reason is that it doesn't dissolve properly without extraneous measures like bubbling c02 through it. So, if you need to add alkalinity (and you normally don't), use something like pickling lime or baking soda which would be effective if needed.
Most grists and water combos need acid, not alkalinity. What was your mash pH? That's really the important thing. (And no, it wasn't 4.6!)
For me, "less is more" really does apply. I see no need for canning salt, for example, unless your chloride was low and you didn't want to add more calcium but that small amount won't matter.
I generally use only gypsum and cacl2, with a bit of acid, for 90% of my beers.