Inconsistent Layerlines

Hi all!
So yes the feeder is clean so far. I also suspected the Wear of the feeder wheel but for me it seems to grip enough.

What I suspect is the temperature swinging around the set point for ±2deg. Support tells me that it is totally normal.

I put some thermal paste into the heat blocks hole for the heating cartridge, Sensor is properly attached, nozzle is a Phaetus Tungsten 0.4mm nozzle but the problem occurs also with other hotends.

Sadly I can’t modify the PID values or run an autotune.

good