You really have to do your own tuning, as some parameters depend on the environment. I had to re-calibrate after I moved an X1C from a small room to a larger room, because the small room held heat better.
That said, I started with the default SUNLU PETG High Speed and changed the following:
Flow ratio: 0.95
Enable pressure advance/Pressure Advance: 0.026
First layer temp: 245
Other layers: 240
Plate temps (all layers):
Texture PEI: 65
All smooth: 70
Supertack: 35
Retract on layer change: true
Retraction length: 0.5
Wipe while retracting: true