You're talking a lot of sense. I've made a few changes to settings. I'm currently printing in PETG 240 bed 80. I've attached the factory file as asked and the FFF. My problem doesn't necessarily come from the material/printer end, as much as the slicer end.
The model:
https://www.thingiverse.com/thing:2151104
Model hair before slicing:
How the hair slices:
I took one today and one yesterday, so they're slightly different spots, but the same area overall.
My settings from Cura are the same as best I can tell - and doesn't give the "Morse code" hair. At very least I tried to bring over as many settings as possible and even watched a few videos on setup and new features. One telling me to set perimeter overlap to at least 65% which was the setting prior to 4.0, but from what I understand that only affects things like infill going to the perimeter walls.
I can provide pictures of the settings screens if you'd like, but it feels like overkill.