So you want it to taste like a Gouda, so are you making Gouda? I would use a culture Flora D or mm100 the help producing the buttery flavor and drain before 6.3 as to starve the bacteria for a sweeter cheese. One thing to remember raw milk needs half as much culture (as far as my experience goes) I loosely use Peter Dixons recipe. If you have a ph meter the final cheese I shoot for is around 5.4.