Can the Harbeth 40.1's boggie ?????

Oh and I'd also pull all the ASC stuff. You may have the room over damped.

Again, Erikminer made some valid observations. Although the Harbeth will not rock like some other speakers, Classe + Purist + "Harbeth" + Overdamped room can be a recipe for disaster if one seeks thrill and excitement. If using ASC absorption panels on 1st reflection points or anywhere else, may I suggest taking them out(and replace them with diffusion if you have some). In my room I always prefer diffusion than absorption as the latter kills life and dynamics in music especially with the Harbeth.

Something to think about to alleviate the current situation.

No, Harbeth monitor 40.1s cannot boogie. Read Bob Neill's comments about them. He got tired of them and moved on because they never could lose their stiff upper lip.

If you remove the Harbeth issue and restate the OP in a generic form it becomes "why doesn't my high dollar, audiophile approved system sound good on classic rock recordings?" In its many forms this is one of the more popular posts on Audiogon. What's happening is that your high end system is really showing you what the classic rock recordings sound like and you're finding that you don't like that sound. It's accurate, but not that enjoyable to listen to. High end systems are really about finesse and refinement. Some can go loud and have great rhythmic qualities, but they don't do raunchy very well. It's the nature of the beast. The fact of the matter is if you're listening to classic rock you're better off having a pair of double Advents matched with a large 70s Marantz or Pioneer receiver in an acoustically untreated room. Yes, old is the new new.