@Gubbfittan when you say you are struggling to get ‘good enough’ prints, what exactly is the problem you are seeing? You don’t say! Also, please send M115 in the console of DWC to show what version of RRF you are using, and post the response.
Your extruder appears to have a low step rate, M92 E146.1, which might impact quality. Jerk is quite high for X and Y, while acceleration is quite low. Motor current is quite low, 700mA for all axes, but this might be because of the motors.
The only actual error I can see is this line:
M556 S100 X0,053 ; Kalibrering CaliflowerUse decimal points, not commas, for decimal numbers.
Your start.g looks sensible. What program are you using for slicing? Post the first 100 or so lines of a Gcode file that exhibits problems.
Ian