I notice bloated mid bass in that song which I find very annoying. It wasn't on an Omega based system I tried it on, but my little Altec ATP3 2.1. In your latest picture your system looks better set up than in the previous image. I would keep the lamps from heating up the speakers - from here it looks like they could. Speakers don't like that kind of heat.
I personally like JLMs suggestion of one big monitor vs multiples, and with that big monitor set back against the wall. I keep my 23" Dell close to the back wall so the speakers aren't compromised by it.
One thing you will notice with the Super 3i and Super 3 Desktop is the linearity of the frequency response, hence no mid bass hump like your B&Ws likely have (and my Altec likely has). When I tried the earlier Yes Band song on the Omegas, the irritation you spoke of was less (taking the poor recording quality into account).
I realize you're hearing this from an Omega rep, but nothing I've heard touches Omega on the desktop. With solid state or tube.
One more thing. If you can, try a different amp and/or DAC. It can make a difference too.
Bottom line, I think your problem is a combination of 3 things. The setup in general, possible bass bloat from the B&Ws, and the recording quality of the songs in question. If your amp has a lower damping factor than is usual for solid state, that could be a factor too, but I highly doubt it. Musical Fidelity has been designing and building amps for a long time and should know what they are doing.
I suggest you try a set of Omegas on a 30 day return. Little to lose in that.