Would adding a pre back into the system eliminate

some extreme glare?
I recently switched from a tube pre to just using a Bel Canto 2.5 straight to the amp. It has more detail but is very revealing as far as terrible sounding cd's. I have also lost the robustness that it had. I have to turn it up quite a ways to get on top but by that time it is too loud. I think I am going to need another pre to take care of that. I still have some mid range glare though that is excruciating. Mostly voices. I am including a list of my setup. I don't know if it is my speaker cables, or lack of pre. I should have good sound with the BC 2.5 and amp I think, but with out purchasing individual components and seeing I don't know. I would appreciate any thoughts. Normal living room, carpet, drapes, pictures, etc.
McCormack UDP-1 love it, plays dvd audio and good cd's with excellent sound.
Silnote Poseidon Sig digital to BC 2.5 huge upgrade from what I had
Harmonic Tech Magic Link II xlr to amp maybe even more so than above
PBN Custom amp dual mono 160w/ch class A/B
DH Labs Silver Sonic Q 10 speaker cables
NHT 3.3 speakers.... plenty capable,they sound great.