Hello, @bagshaw50,
The Code I gave you was for the Shop/Category pages as I also showed in the provided screenshot as well, but now you want to increase the size on the single product page, so you have to try with the below given Code.
ul.st-swatch-size-large li.type-label span {
font-size: 25px !important;
padding: 5px !important;
}
Regards 8Themes Team.