The responsive display looks great on all my pages I’ve looked at except one. It happens to be one with a table, so I think that might be related. When I view this page on my iphone 5 in portrait, the header and content only take up about 60% of the width but the table takes up the full width. I do not have any width specifications for the table.
I am having the worst time finding a theme I like. Yours is perfect for me in every way except that it does not seem to handle tables well and my page with a table fails Google’s mobility test using your theme. About a third of the themes I’ve tried also fail, so you’re not alone. But I have to have a theme that can handle that page well.
In answer to your question, if this is something you think you can fix in a week or two, then I’d be so very happy to switch back! I totally understand if you can’t turn around a fix that quickly, though. It’s just that I need to keep looking if you can’t.