Completely agree with the Wix bit… I’ll have a think and check out Squarespace, thanks! As I’m not really a web designer, I thought it would be best to use something that took that part away and let me showcase my work, but I think I should have spent a bit more time exploring sites that offer better UX.
I’ve had a play with the galleries, so they now have thumbnails to click on, or arrows. It makes them a bit smaller in mobile view, but I think gets around the unresponsive problems you were having.
As you say, the purpose is to get the work across, so if that’s working then that’s great! I’ll keep playing!