echo: first things first. moving gear around in your room is free, and getting the best out of the gear in the room makes more sense than replacing good gear that is badly positioned. a set of floor standers takes more careful positioning than a stand mount, they cover more range, likely are louder and bass loading/reflections becomes more of an issue. A bit of boom, overhang in the lower registers and a change in balance of the frequency range can easily rob your system of it's previous pace and cohesiveness. without seeing and better, hearing the room, it's impossible to say what changes can be made. but getting the best from speakers in a space is pretty much just math. any chnace of a plan of the room? or dimensions with an indication of speaker placement. then we can take it from there. the best gear in the world badly placed can sound much worse than the most prosaic gear placed with great consideration.