I MAKE A ZLEVEL 5 AXIS OPERATION BUT THE TOOL DOES NOT WANT TO LIE ON THE WALL
Zlevel cant generate tool path on negative walls.
Use variable contour operation - with some method - streamline,contour area, guiding curves,..
I would like to recommend you to use the VARIABLE_GUIDING_CURVES operation.
Please, take a look at the attached video.
I hope this helps.