Getting rid of Layerlines / layershifts

Hi everyone, Does anybody know how I can get rid of the layerlines on the cylindrical objects? As reference: the Glock print does not have these, or at least not as noticeable and the white cylinder is even worse than the black one.

All prints had 0.08mm layer height with the the high quality preset, printed on my BambuLab A1 in the interval of 2 days, but the cylinders were printed with 50% speed because it printed at night. Could this have had an effect on the layershifts? Filaments are Bambu PLA Matte White & black.

I also lubed up all 3 axis between the prints, but I cannot imagine that maintenance makes my prints worse xD

For more information just ask, I hope someone can help🙏🏼