Spreadsheet formatting gets messed up when using update to add additional sheets

For what it's worth, based on some other posts I found here, I reconfigured my code so it creates a single spreadsheet object with multiple sheets, rather than individual spreadsheet objects for each sheet, Then it makes a single call to write that object to disk. Than seems to have resolved most if not all of my formatting issues. The basic takeaway I guess is don't use the update action if you can possibly avoid it.