Thanks gentlemen for your very helpful suggestions. I think I need to start with some test tracks, as was suggested, to first establish a baseline and adjust my expectation from my gear. As one of you said, I might be chasing the holy grail of audio and may have hit the limits of what my moderate system is capable to deliver. Taller speakers would definitely help - (did someone say Tekton DI or there’s an echo in the room?!). I’ll also experiment with all the free options you all mentioned and see how much I can stretch the soundstage without compromising all the other elements like imaging, width, etc.
I may give Johnny R a call tomorrow and ask his opinion as well. He’s been extremely helpful in answering all my questions about placement, matching gear, etc., without an even a hint in trying to sell me something. A real class act.