Have you played around with getting the family bonuses in your defense? I couldnt find a defense that held over 2400 cups consistently until I went with 3 from the 2019 HOTM family, and now regularly hold over 2500 and have even had the defense carry me up to 2700+ without raiding!
I know you stated that you have played around with different combos, but I think family bonuses are huge, and the 2019 HOTM bonus is by far my favorite. It also stacks with other attack bonus (I use Boldtusk in my defense) for huge tile damage.
I see you have some of the newer heroes, and I’m not familiar with a lot of their skills, but dont be afraid to mess around with the “forgotten” heroes, as they still have tremendous value in the right team!