Welcome from West Yorkshire.
I'm a rider that keeps to the speed limits, but have taken it to over 100mph in Europe when some roads were not restricted. I had no inclination to go any faster, but it felt perfectly safe. Perhaps a tad light at the front for some reason, but no wobble.
I ride with the screen so that I can see over the top, often at the limit of load (used to be a bit over, but I lost 50lb which helped), and with a top box and pillion. The pillion tends to smooth out the airflow until it has passed the top-box, and is much better to ride than it is when riding solo with the top box. Riding solo, the wind eddies behind you, and side-swipes the top box from alternate sides.
Also, after riding fully loaded, if the pre-load is not wound down again to compensate, it can make the bike feel 'skittish' and un-nerving. Very noticeable when getting to know the bike. Not so much when you have ridden it a lot.
But I have never experienced the Pan-Weave on my A6 or my A9. I probably don't ride fast enough.
Passing a truck with a wind blowing from that side or from the front can cause an issue. The Bow Wave (think of a ship) is phenomenal. If you ride straight through it, it can push you out into the outside lane - but you can deal with it by riding out wide, and then counter-steer gently in towards the truck as you get just behind the cab and before you pass. The fact you are already leaning slightly makes it easier to pass through that wave, and it actually feels very stable.