Sorry for being late. It took me a while to notice that the theme activated on springboardps.com is in directory circle-flip not circleflip.
I tried editing archive-product.php and it was working fine and reflected on the Elevate page as follows:
You will see a subtitle added there. So I believe you can edit the file as you want to customize the header in Shop page.
Just note that those changed might be lost if you updated the theme later on.
Let me know if you need any further assistance.