I've been playing with this a bit the last few months, but am far from an expert here. I usually go back and forth between the Bru'n Water and EZ Water spreadsheets. I plugged your values into each of them and attached.
Bru'n Water is more complicated, but I find is easier to help me achieve a certain profile.
EZ Water is simpler and used to confirm and get estimated PH.
They both assume that you treat the mash water and sparge water the same. I simplified it and said you would mash with 4 gal and sparge with 4 gal so you can adjust for your values.
From what I understand, each style will benefit from very different profiles so it's good to do this exercise before each brew, depending on what you're brewing.