I agree with adding gypsum to balance the chloride. How much I add depends on the perceived effect I am trying to achieve: malty, balanced, or bitter.
Strong says not all the calcium makes it to the boil kettle and Talley puts a pin in it at ~40% of the calcium will make it to the kettle. So, I add CaCl to the mash and gypsum to the boil.
I’ve found if I add the CaCl to the mash and gypsum to the kettle I get much less residue (beerstone?) in the fermenter and keg.