Try downloading the EZ Water Calculator from this forum (you will need MS Excel). Works very well. You can manipulate your levels by salt additions (gypsum and epsom).
BTW, I'm jealous of your water. We have lots of alkalinity and hardness where I'm at, so I need to dilute with 60-80% Reverse Osmosis water from the grocery store (about $1.20/batch). And then add lactic acid to bring the pH down for most of the lighter brews.
Primary #1: Empty #2: Empty
Secondary #1: Berry Rhubarb Wine #2: Black Currant Wine #3: Ice Shanty Bock
Kegged: Hidden Lake Nut Brown, Border Crossing Vienna
Bottles: 2H IPA III, Carmel Apple Cider, Spruced Winter Warmer, Big 50 Barleywine, Framboise Lambic, Dark Belgian Strong, Russian Imperial Stout, Sparkling Elderflower Wine, Barolo Wine, On Deck: ??