You didn’t list a hospital grade wall out let. Run out and get one. Huge difference, ,that can make. .Furutech and wattgate make excellent ones.
then take all of the tweaks out of your system, well away from it, and listen to what you have.
Then work on your speaker placement. Get that perfect. No sense doing anything else till you’ve Done that.
then start adding back tweaks, one at a time. Experiment with combinations, look for synergy. Take months at it.. Just because one of them makes a system sound different doesn’t’ mean it sounds better.
I’m all in favour of tweaks. Yes they can help a lot, but most of them don't, really. But it’s wonderful when you find one that does. The last one I found that made my jaw drop was set of Bindbreakers under my pre-amp. Another recent discovery was that it improves the sound a lot to turn off my power conditioner when I’m not listening to music. And oh yes, reboot my modem and demag the whole system before listening .
Everything you try is going to be system and room dependent.