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.