I use Tiny Tiny RSS on a Synology. It pulls feeds every 15. minutes and I filter the entries based on title, content or tags. It has a great readability plugin that can expand the article to full text. I've been using it for years, it's great.
Do you ever cache content offline to read later? This is my current dilemma. On on hand, you have a nice readability plugin and offline content but the plugin may not read everything well or a bookmark which gives the right page with all the content but not offline