I used to use CURA and I absolutely love Gyroid. It's a torture test of infills. I you can do gyroid without PETG filament snowballing you nozzle you have masted it.
The first thing I did was try to give my prints the same strength I had in Cura. Enter "wiggle". Don't laugh. If you keep rotating wiggle you get a similar construction it's just harmonically nasty to your printer. Give this a try...
1. ) Use a new Extruder config called "Infill". Select your tool index (0)
Whatever multiplier you have for your typical printing the Extrusion multiplier for "Infill" is about 3 points lower. Starvation is better for your test print but watch for filament snowballs.
2.) Goto Infill tab
Select wiggle pattern.
Select "Infill" as your extruder
Add 0,45,90 in both Internal and External Angle offsets
3.) Test print. Increase/decrease "Infill" extruder's multiplier as needed decrease if you blob, increase if the infill isn't connecting with each other or with the walls.
This is what I do and it's been just as good as gyroid. Gyroid was smoother though - but that's the hole point.