If your current test kits and pH probe are correct, bringing your alk up to around 8dkh ( 2.85 meq/l ) will probably bring your ca down to a more acceptable level and increase your pH
I use Elos kits for the Big 3
As suggested, get J&L to test it for you before you spend any dough unnecessarily
Until I start buying the bulk stuff, I use
Reef Builder for Alk, and
Reef Advantage for Ca