I am trying one thing at a time and listening awhile.
Great approach! When you say you “reduced the tilt” what do you mean. As others mentioned, I’d think if anything tilting your speakers back just a tad might help raise your image height. Or maybe I’m just misunderstanding. I still think you could pull your speakers out another foot and move them a foot closer together with just a bit of toe-in. Be interested to hear your thoughts if/when you ever get to that point. My room/speakers are similar to yours and after much experimentation I found this basic positioning to be the best for overall tonal balance and imaging/soundstage, but way too many variables in there to know if it’d be an improvement in your system and for your tastes. Still, very interested as you make each adjustment — if nothing else it’s an excellent (and free and fun) learning experience, no?