I think some room treatments would help in that reflective room. Try throwing a throw rug/remnant betweetn you and your speakers and/or panels on the side walls. Reflections arrive at your ears at different times skewing what you hear.
Also, compressed audio is not the best, even at that bit rate.
I may try putting a rug or similar on the floor in front of the speakers but as far as putting something on the wall, well I have to deal with the WAF (wife approval factor
). The SACDs I have I don't Bitstream them I play them Multichannel LPCM. If the extra resistors are as easy to install/uninstall as stated in an earlier post I may give that a try. Nothing to lose