I would wall mount the TV above where the hi-fi is now and position the speakers either side of the fireplace, ideally with some space between the cabinet edges and the fireplace itself. This would help to make the best of the speakers you have whilst also opening up the possibilities with anything new.
Need a new house, take the hifi with you when viewing, get the ideal room that way...
Sounds more like a room problem rather than a speaker problem, however as you have now found your ideal balance just enjoy the music.
Bill