Practice all of your mechanics in front of the mirror. What is perfect in the mirror will not be perfect during a game but will be better.
Do you lock your elbow? Allow yourself a little bend in the elbow and have more of a strong hammer slightly in front of your face. This would be a way to begin to have a straight arm. It will look stronger sort of like an NBA official. This will look straighter to an evaluator that is looking at you from the front.
Find a comfort zone for you. You might take small elements of someone else's mechanics to make your own. Play with what works best for you and still satisfies your evaluator. I really mean play with it! The more you do this in front of a mirror the more you will be able to control what mechanics you use.
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"Be more concerned with your character than your reputation, because your character is what you really are, while your reputation is merely what others think you are." -- John Wooden
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