JP definitely needs to go back to Mark amps. Not digging the Triaxis tone at all recently. The 2011/12 tour with the Mark V, it felt like his palm mutes were punching me in the face.
The Majesty guitar would sound enormous live through the V.
I really loved his Mark V rig, but honestly when I saw them play on the DT12 tour, the Triaxis rig sounded fantastic. It just hasn't been captured well on a live recording yet, as good as BtFW was, the guitar tone was flubby, especially the palm mutes, like you mentioned above. But in the room, actually hearing the Triaxis rig live, it was big, heavy and punchy.
It sounded to me that on BtFW they didn't capture much of the room sound (how the guitar sounded more than an inch or two off the speaker cabinets). The tone sounds digital and a little too effects laden. I feel like it was missing the body that it has when you hear it in the room. Makes me wonder how they captured the sound for the DVD, if they used the mic feed that they use for the house sound live, or if they went directly out of the Triaxis rig. Either way it sounded like it could have used a couple extra mics that night sitting a foot or more back off the cabs to blend with the mics right up on the speaker grills.