Hi Piddler, what is your end goal for your fletching? For me, if I am going to cut feathers with the chopper, then grinding gives me the best result. But if not, then I like to just strip the feathers from the quill. That said, I hate grinding/sanding feathers, it's just a stinky messy job. I've come to like a 2 fletch with no grinding necessary, or a 3 fletch with stripped feathers and cut to shape with scissors.
Hope this helps answer your question.