well the 50% is from my experience ,
most people say max layer height is 75% of nozzle diameter.
but as there are tons of settings and different printer setups it´s hard to say .
you can also try to reduce and increase print speed to get a direction or see if there are changes.
1st is to check if extruder is calibrated well , then try to print a single wall object to get result of extrusion width
adjust that with filament settings. it´s simply like a gamble of patience to get a feeling for "what happens when i change which parameter"
