How good can it get, really? - my stereo sounds amazing!

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So is your pre section of the Rogue totally bypassed ? If not NOS Telefunkens are fantastic.

I’m not sure if the pre in the Rogue is totally bypassed. I would assume that it is given that I’m now using the aux in to run the MS Phonomena II+ pre. The MS pre is a solid state unit that is super quiet and sounds great but I’d really love to get back to an all tube signal path. I’ve been considering either the Rogue Ares Pre or the Herron vtph-2a. They’re both roughly the same price and both get great reviews. The Herron might get a few more positive reviews than the Ares tho... hard to decide!

Its Fantastic that you are happy with your system. Rogue Audio makes great products and has excellent customer service as well. Very friendly for Tube Rolling - NOS Siemens are also some thing to consider along with the previous suggestions of Brimar, RCA and Telefunkens - ECC83, CV4003 - Brent Jesse is a great resource to check out for those products.  As a Rogue Amp owner I  have found that the more power I supply them (Power Delivery - PC) the better they sound!!!

You added a second Sub to your speaker set up, which I agree with (I have a pair of B2s) however you seem to feel they are a little off ?  I will point out that Rel  recommends the S/510, the next model up from the T9i as an appropriate match to your B&W 805s. There is a significant difference between the two models. I believe due to the frequency response of the B&Ws the T9i may just fall short of covering the range. You may already know this but the Hi Res Neutrik connection is the way to go. Rel sells them, but so does Analysis Plus and Synergistic Research. 

Continued Enjoyment of your System...

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IMHOyou  can not go wrong with another subwoofer no matter what else you plan on doing.