Use glue.

Have you tried increasing your first layer extrusion width? A wider first layer will squish the filament into the build plate more, which might help. I use a 140% first layer width.

All my petg experience is with a .6 nozzle, printing on a glass bed, but there's some takeaways that hopefully apply to a .2 one...

Going very slow and increasing extrusion width helps a lot. And keeping acceleration low-ish, decreasing travel speed too much doesn't help ofc. The narrow extrusion of a .2 nozzle reduces the surface area of a single line even more, so probably you need to increase the line width even more.

Additionally, I've read somewhere that petg kinda likes to stick to brass but not glass. So having the bed as hot as you can get away with for the first layer and the nozzle as cool helps too.

Are you able to mess with the first layer offset on the bambu printers? May need to bring your nozzle a bit closer, especially with a textured surface. Temps seem comparable to the stuff I have on hand.

For cleaning, is soap and water compatible with your surface? Personally found that while IPA is fine for maintenance, a few drops of unscented dish soap in water works extremely well as a degreaser, I've literally washed stubborn surfaces in the sink. Petg is super picky with any residual oils and the small nozzle could totally make that worse.

Maybe try running slower? Just to eliminate variables, may be worth running a quick extrusion calibration? Petg can be an absolute pain for bed adhesion in my experience.

A quick and dirty thing to try is to increase your first layer height, .1mm layer is a pretty fine layer line. Bumping the height up can give you a bit more contact area and increase adhesion some. And slow down. The default settings are NOT gospel and the HF doesn't mean you can or should print that fast. I find when using such fine nozzles I often need to reduce feed rates by 30 to 40% to get things to hold. And I even drop the acceleration rates by 10 to 15% to keep corners from not sticking well.

Speed ain't everything.

I would try lowering layer height and slowing it down, especially on initial layers

Aside from adhesion itself, maybe that specific filament is (also) underextruding?
I have has a batch of 1.75mm filament that was actually something like 1.6ish. I tried to have it stick, but nothing worked because it simply wasn't extruding enough.
I eventually measured it with calipers, set that in the slicer and then it started worked fine.
Similarly, maybe your .2mm nozzle has a partial clog?