Hi @chatmatt,
I hope you are well today and thank you for your question.
You can try achieving this by using the custom solution shared in the following topic.
https://colorlibsupport.com/t/how-to-make-only-one-post-full-width-and-the-rest-in-grid/
Before using the custom CSS code shared in the above topic you have to remove the following custom CSS code you have used on your site.
@media (min-width: 768px){
body.blog.home .page-1 article.post:first-child,
body.blog.home .page-1 article.post:nth-child(2) {
width: 50%;
clear: none;
float: left;
}
body.blog.home .page-1 article.post:first-child {
padding-right: 25px !important;
}
body.blog.home .page-1 article.post:nth-child(2) {
padding-left: 25px !important;
}
body.blog.home .page-1 article.post:nth-child(2) .post-inner-content {
padding: 0 0 50px;
}
}
Best Regards,
Movin