This is one of the things that always bothers me. I do the following workaround. First, I match with G0 and the “Refine” option, then I delete the History (I keep it active all the time) for that very surface, then I apply another run of “Match surface” either with G1 or G2, but this time without the “Refine” option. If I match directly to G2 with “Refine”, quite often Rhino adds way too many unnecessary control points.