Set St. Tammany up as its own budget, or leave the Northshore alone
Lake Pontchartrain is not a suburb boundary, and an account that ignores it spends Orleans money in Covington.
A radius from a shop in Mid-City or Metairie will happily include Mandeville and Slidell. The clicks are real, the calls are real, and the dispatch is a different business. Unless you have crews stationed on the Northshore, every one of those calls ends in an apology or an arrival window you should not have offered.
Run the Northshore as its own campaign with its own budget, its own ad copy and its own landing page, or exclude St. Tammany Parish entirely. The middle option, taking the clicks and hoping, is the expensive one.
The West Bank deserves the same decision. Algiers is close on a map and separated by a bridge in practice. Decide whether you cross, then set the targeting to match the decision rather than the ambition.
Use location targeting set to presence rather than interest, and check the location reports monthly. Metro level targeting has a way of drifting into places nobody agreed to serve.