SoCal,

That's a pretty easy one....use the soft water..no doubt. Do you have any idea as to the source of the Calcium. Normally, it should be stable and I see you're not using Cal Hypo....I can't imagine how it's getting in there. Anyway, use that CH=20 water...as much of it as you want but probably not less than 60% of your total pool water. That'll get you down around 250ppm which many folks think is ideal.

The rest of your tests look dead on the money (nice work!) and, yes, it's always helpful to see test results even if they're not pertinent.