I as other have said think if you are pretty happy then changing for change sake is not the right answer. I'm lucky in that I have a music lounge setup just for hifi 7mx5mx3.2m acoustically treated a bit ...side points ...corner bass traps and rear panels ... 3 thick rugs on top of each other etc .. I did nothing to roof as lovely victorian cornicing and ceiling rose ....
Everytime I think of changing I make myself pause now.is it just an itch to scratch or is something wrong? It sounds like so much is right with the system that apart from speaker position tweaks I would hang fire .... Have a holiday instead probably cheaper and that will refresh ears in a new way.
Just my tuppence worth