0.2mm nozzle PETG settings

Hello all! This is my first thread although ive been into 3d printing for quite some time.Recently i choose to buy some 0.2mm hardened steel nozzles to give them a try. ive always used 0.4mm nozzles and i was trying to achieve perfect print quality in terms of outer surface. 0.4mm nozzles ended up being too big for 0.04 or 0.08 layer height so i decided to buy 0.2mm nozzles. It seems its not so easy to print with perfect quality just out of the box so i started triying different settings.My PETG prints perfect with outer walls speed up to 30-40mm/s (higher just leaves tiny artifats i just dont accept). fan 20% and some other minor settings like coasting, pressure advance and input shaping(although this last one at low speeds i thing is not quite doing the job). PETG-CF prints looks astonishing with an outer surface almost perfect and without layer lines.ive tried to go lower in terms of layer height up to 0.04mm(best i can do with my ender 3 v2) and works but i started noticing some artifacts due to too big nozzle diameter so i bought 0.2mm nozzles hoping this would go away.im finding very dificult to print with this nozzles and specially very small models and i ve tried lots of settings to make it work.At the moment in comparison with teh 0.4.. nozzle ive reduced speeds drastically, which makes sense. next step was also decrease print temp and increase fan because cooling issues appeared. also reducing flow to 95 seems to help. I want you guys to share your thoughts on this and advice to get to perfect prints on 0.2mm nozzle with very low layer heights. Also i havent tried the PETG-CF on 0.2 nozzle but im willing to, since nozzles are so cheap taht if one gets clogged or damaged, i can just replace it.

I kind go the other way, I make my own .95mm nozzles from older smaller ones and print with .5mm Layers with larger items. Never used PETG with CF but typically from what i have read, you should use a .6 or larger with infused filament as the fibers can be larger than your nozzle. I typically only use ABS when using my .25 nozzle but in the past have used PLA. I also understand that 3d printing is not injection molding and gave up years ago on trying to get "Perfect looking" parts and went with really strong functional parts that print fast (wide tall layers = big parts faster even though you print at slower speed) . Of course we may be talking apples and oranges as I no longer print bobbles and doodads and mostly items I have engineered. I installed my .25 nozzle the other week when I prints 2mm tall 10-32 washers/spacers and some LED holders using ABS. Best advice is keep at it! What works for others may not be right for you machine, your model and your filament, so kind of up to you to figure out what will work for you. Good luck with your quest for perfection, don't let it get in the way of quality and structural strength. A lovely looking part that delaminates or breaks is not helpful.
One other thing to mentions, I have found when printing with small nozzles and attempting very thin layers, you need to be careful about print speed. Too slow and your filament is in the hot nozzle too long and cooks.. leading to clogs and water pops etc.. I typically print anything with a layer height less than .2