Hi @Yozhik have you had any issues with wandering base resistance when the 510 screw is adjusted? Mine is all over the place with just single turn 0.05 ohm change or more either way!!
Not that I recall, though I never had much need to adjust the 510 screw. Only problem I've had with inconsistency was letting the build deck get too dirty, but the ultrasonic cleaned it up and the problem went away.
Does the problem occur with the build deck ring? Or just with the tank?