Please…
Calibrate your extruder (E-steps) with the new filament.
My PETG prints best at about 225°C.
With 0,20 mm layer heigth you can print at max. 50-60 mm/s.
The standard nozzles are just fine to print this material. But you will notice that you have to change the hotend more often than with PLA because of the higher temperatures ans the different material. The nozzle is not the problem but the PTFE tube inside the metal inlet tube. The tube cloggs up the hotend from time to time.
I bought a roll of 3/2 mm PTFE tube (OD/ID) to save money (by saving the metal parts of the hotend and just replace the tube).
For me a Z-hop with retraction helped a lot with the stringing problem.
I just check and remove possible build-up on the first and second layer.