Everybody doesn't have this issue... and if you did not before, I guess I'd look at mounts some more. Tough issue to nail down. While many "live with it"... I would not label it "characteristic".... at least not universally.
You're sure it's not a tire issue, it sounds like.... but I'd rotate just to rule out a bad tire. Tires are all wearing evenly I presume.
One thing you could be dealing with I suppose is the center bearing on the propeller shaft????
Really grasping at straws, but you said it goes away when you accelerate or go to D3. Both of those actions change the load on the drive train at least momentarily, which would break a resonance type vibration. The question of course is where that is coming from.
More speculative points of wonder..... wheel bearing, ball joint? Without other symptoms it's just hard to know.
You 'might' want to take it to a very good "front end" shop & ask them if they can do a "powered" test (dyno or whatever) to trace your vibration. It can't hurt to ask. It can't cost too much & you might find out something.
One last Hail Mary thought: Next time you're recreating this vibration, push off your VSA and see if you get any change.... I really don't expect you will, but it's one more thing to rule out.
Good Luck... I'm not optomistic
