1. This "pet peeve" unfortunately demonstrates a lack of understanding of the issues involved in creating recordings. The information you are after is far more likely to be misinterpreted/misunderstood than actually be useful information because mic setup is only one part of the equation and in most music genres, one of the least important/relevant parts of the equation! Even in those genres where it is particularly important, most classical music for example, the placement and balancing of the mic inputs within the mix is more important. Furthermore, in such genres, the mic setup can/will vary considerably according to a number of variables: The music itself, the orchestra/ensemble, the recording venue, the delivery format of the product and the artistic desires/intentions of the artists and producer. It's a bit like asking for the information of a car's engine size: On it's own that information is largely worthless/misleading, it tells us little/nothing about the car's performance. It's only useful information when COMBINED with all the other relevant information (vehicle weight, aerodynamics, engine tuning/power output, power train delivery, etc.). In the case of recordings, all this other relevant information is impractical to publish in say a CD booklet; it's too much to fit, in the case of some recordings is never written down (and can't be), is often not desirable to publish from a marketing or commercial perspective and unlike with cars, pretty much no consumers would appreciate/understand what this other "relevant information" actually means!
2. Bis have produced some very good recordings but never, as far as I'm aware, with an A-B mic setup. Sure, they *sometimes* employ an A-B pair as do many/most other labels but only as part of a much larger array of mics. I believe that Bis' early releases (pre CD era) did only use a mic pair but I believe that was a single stereo mic or a coincident pair (such as a Blumlein pair) not an A-B pair. For at least 3 decades or so though, Bis have used a multi-mic setup, as do all the other labels (going back as far as the 1950's), which in the case of an orchestra recording would typically be 20+ (as many as about 50) mics. Here's the mic setup for a Bis recording of Mahler's 5th
http://kazuyanagae.com/20180815BIS/16BISRecordsMinnesotaOrchestraSetup.pdf, using an A-B pair for the left and right surround channels, a not uncommon sort of setup.