Have you calibrated the speakers? I've used that Radio Shack SPL meter to set up my speakers, but on a personal level, I still felt that my QS8's were lacking a bit as well. So all I did was turn them both up one decibal and I'm a lot more satisfied. I'm not sure it will help your situation or not.

M60s
VP150
QS8s
Marantz SR6003
Samsung LN52B550
Oppo DV-980H
Insignia NS-WBRDVD