yes :-)

The initial calibration with the knobs is to try and get the bed as level as possible. It's the single most important aspect to getting good prints.

The z gap from the slicer, is to adjust how much downward 'smoosh' you give the filament. THis varies depending on how 'sticky' your actual print surface is.

Try adjusting in 0.05 mm steps.
And also recalibrate the bed.

I find that replacing the normal bed levelling nuts with locking nuts, helps. That way, once it's physically level - it should stay level. Vibration will cause normal nuts to move over time.