Instead of blocking channels, trying going through your watch history and deleting anything you've watched in the past that's similar to those. YouTube heavily leans on your history for recommendations, so if it's recommending those, it's because you've watched related stuff.
My YouTube feed never recommends any of that garbage.
Try opening YouTube in an incognito window sometime. Scrolling through a few, I see:
* Banned Amazon Products you NEED to See to Believe!
* This has NEVER Happened Before... (Severe Weather Channel)
* Our Dog got Married and had PUPPIES! THE MOVIE Emotional
* I WENT TO GHOST TOWN AND SOMETHING HEARTBREAKING...