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Just experiment with the angle of your release and you shouldn't have any problem getting the disc to flip. I was having the same problem for awhile until a guy told me to tilt the skyward part (top part) of the disc in towards my head.
The best advice I can give you is to just quit playing :) That way you'll stop whooping up on me in tournaments. Seriously though, it sounds like people are giving you some good advice on here. I'd try to offer some advice, but you're already better then me anyway.