Finally, I found the way to address the posts (thought I had tried this one before, but obviously I had’nt):
.postid-572 #feature-slider { display: none; }
.postid-572 #featured-content { display: none; }
.postid-577 #feature-slider { display: none; }
.postid-577 #featured-content { display: none; }
.postid-575 #feature-slider { display: none; }
.postid-575 #featured-content { display: none; }
.postid-581 #feature-slider { display: none; }
.postid-581 #featured-content { display: none; }
🙂