The combination of a very small nozzle like 0.2 and a low layer height like 0.4 will give problems with the E-resolution (the stepper that drives the filament).
By heart: when you use 0.25mm nozzle with 0.06layer, a single E step is good for ~1mm XY motion. That is too much.
Have you seen examples of 0.4mm nozzle at 0.06mm with PLA? You might be positively surprised.
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XYZDesignPro 70
Have you considered 3DSolex?
http://3dsolex.com/
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