I have found measuring nozzle diameter is very difficult. I did it by inserting a needle (with cone shaped tip as all needles have) until it stops moving inwards, then marking the needle with a marker or tape. Then removing the needle and measuring it's diameter where the needle stopped.
But it shouldn't matter much. You can print .4mm wide lines with a .35 nozzle just fine. Cura extrudes the correct amount for .4mm and puts the stripes .4mm apart. The actual nozzle diameter matters but it can be off by 25% no problem.
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I have also been having issues with underextrusion on the infill (multiple types of filament). The problem might be worse at higher speeds. It would probably be a good idea to look at how Cura handles the extrusion rate. Is there a function used to determine extrusion rate that includes any parameters other than print speed? If so, those other parameters should be removed from the function to prevent problems with both solid and nonsolid infills.
Thanks
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