XMP is enabled with everything set to auto (I've tried configuring it from "auto" to 2n in the profile, but it isn't a drop down and typing "2n" "2" "2N" and other variants just defaults to auto auto, not sure about what the syntax it could possibly want is)
I am unsure by what you mean about bankings
When I originally installed them, I did a full dusting of my computer at the time. But I will attempt that again (any physical hardware configuration alterations are unlikely since it's 3am for me right now)
As in the OP, all 4 modules are in, only A2 and B2 are being used by the motherboard, while all 4 are detected by the motherboard in the hardware browser, and 16gb does show up in cpu-z