Bambu Lab X1C First Layer Issues

[BordoReiz]

I’m running two X1 Carbon units. One is an absolute beast, but the other one is driving me crazy with first-layer issues.

The printer can’t seem to hold a consistent Z-offset.
Sometimes it digs into the plate. Other times it prints too high (gaps between lines, bad adhesion). See attached photos
What I’ve tried so far:
1-Installed a brand new Hotend Assembly.
2- Installed a brand new Textured PEI Plate.
3- Washed the plate with dish soap & warm water.
4- Ran full calibration multiple times.
5-Cross test: The exact same G-code prints perfectly on my other X1C.
Has anyone experienced this kind of sensor inconsistency?

[eried]

is the same filament on both? quite strange, maybe the extruder has an issue

[BordoReiz]

Yes they both have the same filament.

[eried]

looks like extruder issue? maybe it is clogged or something else? I dont think is a sensor, since they affect so little (and it doesnt look like the leveling is actually wrong)