"Crap of Thirds". I like that, and it's exactly true. I can usually tell a Crap of Thirds photo because the composition is often awkward and imbalanced. The correct rule of composition is "Make it look good." A lot of that is a balance issue that can't be stated in words and refuses to follow rules, but is felt. If you were happier when you were going by feel, you were probably doing it right, and you should go back.
When I taught photography, years ago, I used to tell people that they grew up fed on good composition, in ads, on TV, in movies, and that when shooting a picture they should move the framing around until it looked like something they might see in a good publication. Unfortunately that idea doesn't work as well as it used to, but moving the framing until something clicks is still a good idea. You might start looking at pictures in terms of trying to find the balance that's there, and feel whether it's good or bad.