Upgrade suggestions needed

just moved up from my old yamaha m-80 and i can't believe
what i've been missing. now i want more , and i could really use some help.
my current system is a rotel 991 cdp, krell
krc-3 pre, rotel 1080 amp and my old a/d/s L1590 speakers.
ic cables are custom house " barracuda " (xlr) and i'm using braided cat-5 cable for the speakers (bi-wired). i also have an old b&o 3300 turntable which i need a pre for, or maybe i should just replace it.
right now, things sound best at higher levels, but lacks warmth , some cd's are fine, others are too harsh,( making the speakers way too bright) and some seem almost perfect.
should i try a differant cdp,an upsampler or try a new amp . was thinking of a c-j mv-55 and a rega planet or a musical fidelity a3-24 , but would appreciate any advice. thanks for your help.
i listen to all music, but prefer blues,ie. robert cray, susan tedeschi etc. and the room is kinda large, 22 x 28 x 11. thanks again