Solved!
@rdellconsulting: Thank you for your response! I’ll likely make use of this info in the future. Very detailed and informative.
@themadwiddler1200: This was the easy way out. Thank you for pointing out what probably should have been obvious to me. I’m new to word press and would usually have gone the code route to accomplish minutia. But in this case it proved to be classic wordpress design: The easy stuff being a little tricky to find in wysiwyg menus, and the difficult stuff easy via code.
Choosing “No Sidebars: Full width layout” for “The pages Default Layout” setting and checking the box “Force default layout everywhere” got everything centered. Likely choosing both left and right would have done the trick as well.
Cheers!