No news. I noticed something - not excluding the aux fan - when using the quality profiles for fine or extra fine. In both cases I’ve never ever seen any artefacts on my machine. I am at 13days and a couple of hours of combined print jobs (see machine serial dialogue). Whenever I go for less quality it seems to depend on luck 
it’s not permanently happening but could also be the weather inside my room. Sometimes cloudy and smelly, oftentimes dark and usually no air to breathe… 
To add another point to this discussion, i’ll add my latest print, done solely to check if i’m also plagued with this issue, since i’ve got few of my prints exhibit similar issues.
All the tests prints i’ve done to see z-banding did not exhibit those issues, also done the belt tension calibrations and nozzle wobble & fitment tests, and yet if i print either large planes or rounded it shows under point light source (diffused lighting hides those defects).
So, in your expertise does this print matches the problem/issues your’e experiencing?
EDIT: look at the details on legs & torso
This print looks great in my opinion. You will always see (uneven) layer lines to some extend because it’s a FDM printer, especially when you hold a lightsource above your print. There are some holes visible but this has nothing to do with z-Banding. I also had these holes on of my prints and the problem in my case was the retraction distance. The standard value in Bambu Studio is 0.8mm and this is too high for most filaments I tested over the last weeks. Try to go to 0.3mm or 0.4mm.
Most of the times issue are as in those photos, and now that i think about it, it’s especially pronounced in the planes along Y axis, as if those two linear rods holding X gantry are prone to misalignment(?) due to the vibrations(?).
I’m not entirely sure, but i haven’t experienced as pronounced “artifacts” as these in rest of my models on the Y plane.
For now i’m happy with the ability i’ve gained with this printer (came from A1 mini), but seeing those artifacts somewhat dampens my enthusiasm, nothing left but just wait for better printing profiles
I know exactly what you mean. I feel the same. I started my 3D printing adventure with a Raise 3D N1 about 6 years ago so the step in technology was quite big for me but I just hoped for a bit…more. Don’t get me wrong, it’s a great piece of hardware and I really like the dual nozzles and also the new AMS 2 Pro but I just hoped it would be a bit more plug and play. At the moment I need to change a lot of things in the slicer to get a result that is on the same level like my Raise printer.
It’s been 3 days since the birthday party haha, did you get around to installing it?
I’ll go even further - when I use the quality setting ( 0.12mm Fine @BBL H2D ), I’m consistently getting almost unbelievable surface quality, as well as repeatable functional 0.05mm gaps between filaments extruded from different extruders.
Of note, my testing currently is with undried 2 and 4 year old rolls of PLA.
[I’ll post the test model and photos and video when I’m able].