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Having issues with my boomerang?

This is my boomerang I made out of some plywood I had. I have sanded down the wings so they have the airfoil shape. When ever I throw it, it goes out, starts to loop around, and seems like its coming back but falls before it gets too close. The closest ive ever got it is about 30ft out to my left. To throw it i hold it like a gun, point it away from, tilt it a little to the right and throw it. Is there something wrong with my technique? Could the problem have anything to do with the shape of the airfoil on my wings? Or maybe there is a better desgin I could use to get to learn?

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