Not sure if that is what you are looking for, but I developed nooshub.com for that reason. It has the functionality to group similar articles, and the stories you don‘t wanna miss usually produce large groups that are then presented as top news. There is also a „in a nutshell“ page for top news from all feeds and a „gems“ page for low frequency content that otherwise can get buried. Maybe it is what you are looking for and works for you, it takes a little bit to setup but once it‘s done it is like checking Twitter…