How to fix my detailed, accurate but BRIGHT system

Hi everyone, I need help. I like my system in that the base is tight, it has good detail, it's dead quiet and it plays well at higher volumes. What I don't like is the mids and highs are way to forward and the system is lacking warmth. I don't feel my system is very musical or engaging. I'd rather not replace my amp and speakers as I think they are a good match and I don't think I can use a tube amp as these speakers are hungry. I have a large room 22'x38' with a 17' ceiling. I have a lot of glass and all tile floors. Room treatment is not an option as this is our main living space. Should I try a tube DAC, Tube Pre., tube Buffer? How do I warm up the sound I'm getting? My system consists of the following.

Rowland Capri Pre.
Butler 2250 SS/Tube amp
PS Audio Digilink 3 Dac with stage 3 mod.
Aerial 7B speakers
Integra DPS-6.7 DVD/SACD
Wadia 170i (files in lossless)

Thank You in advance for your input!