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Thanks for the replies.
I've checked my rotors/pads/calipers. All ride smoothly and no issues/rubbing/sticking, etc.
I have tried to shift into sport mode, punching the RPM up and seeing if there were any change, potentially being related to the engine speed/engine mounts, but no difference there. I'll try to drop it into neutral, but that'll be doing 80mph+ so I'll only have a short time to see if it dissipates. I'll check fluid level in the tranny also, to see if somehow, that's contributing to the issue
I've checked the center support bearing and pre-load, along with both the Guibo near the transmission and have replaced the Guibo at the rear differential (older F12's had two of them). I just replaced the differential bushing, which I was hoping would solve the problem, but it did nothing.
If I finally get to the root of the problem, I'll post my solution in order to help the community.
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