[Joon Park]

In my opinion, the orientation of the Frisbee, either during launch or in flight, doesn't really matter if you're doing anything in the realm of less than 2ft. But I wouldn't really consider that "throwing," more of "lobbing" the disc.

If you're actually considering successfully and accurately throwing the disc over some significant distance, I can't imagine the discs being oriented any other way than right side up and being give a whole lot of spin: the way they're meant to be thrown.