I have a very similar issue, but the way I see it, MatterControl is printing an extra first layer (with the big gaps and other issues the OP mentioned). I've come to this conclusion based on measurements and comparisons with printing the same objects with other slicers. I don't see any settings which would control printing out this "bed" level, is there a way to get rid of it?
Posts made by awmyhr
RE: MatterControl First layer quality