V3 Plus first layer problems high and low

I’m having problems with my first layers on my v3 plus.
for example a large rectangle:
the auto calibration is putting the z-offset way too low, so i correct it manually, - but the first layer will have low, good and high parts too it, often in perfect distinct areas, like this {/ /]
this leads me to believe the auto bed leveling mesh programming is somehow flawed or something.
Has anyone else had such issues?

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I don’t know exactly what it is but I’ve heard of similar problems after a firmware upgrade. Possibly after a nozzle change. If you did any of that then revert it back. Factory settings, nozzle tightening … .

Exactly what’s happening to me

Doesn’t affect small prints
I “fixed it” by re slicing this part and increasing 1st layer line width from 0.5 to 0.6

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