I own a pair of Harbeth P3esr speakers. Nobody would ever claim they have too much bass (what bass they have, however, is well rendered). I pull them out into my room for critical listening, but they normally are about 14" from the back wall.
The P3 speakers are unique in Harbeth's line in that they are a sealed box design. They take a bit more power to push, but they are more forgiving when it comes to placement. They have a signature Harbeth sound which you will either like or not. They will not be as accurate and punchy as the near-field monitors you are using now.
I bought the Harbeths because I knew they would be near the back wall most of the time. I also like their more natural, easy going sound compared to more strident speakers I have auditioned.
You will be able to get the BM6 speakers to sound much more balanced if you pull them from the wall. I use Sound Anchor stands with carriage bolts substituted for the floor spikes, allowing me to move them around easily. Depending on your floor and room, this may be a consideration; the speakers do not have to be in the same place all the time, and they are easy to move. Other good suggestions are acoustic room treatments, digital room correction, and equalization (in that order).
I agree that bass levels are more articulate in many modern masters and re-masters. This is more a function of taking advantage of better playback technology than was generally available in the past. I do not think there is some conspiracy to increase the bass to generate sales (see caveat below). The program material and intended audience will inform the mastering. I have been mostly very impressed with modern mastering on the music I listen to.
Caveat: I do not listen to much Pop, Hip-Hop, Rap, or mainstream Country. Those idioms appeal to a different musical audience – one that apparently appreciates high levels of compression and overwhelming bass (maybe because they are listening on ear buds, bluetooth speakers, or home theater systems).
