I got PETG working on my Mini clone by basically just switching to 0.6 nozzle profiles from the wizard and using the generic PETG profile.

But, if you’re new to PETG, know that it gets real moisture sensitive, real fast. Sounds like you might benefit from trying to dry the filament out, check the web for more on that.

After making sure the filament was dry and that my initial layer is good, because changing nozzles means you need to fine tune the z offset again, I would print a retraction tower test and dial in retraction length settings.

That a good basic troubleshooting list.

yeah, without the config, it’ll be hard to say anything meaningful. if you are open to alternatives, caddy does this well and is super easy to configure.