KrisRD has the right answer. The 300 spine arrow is to stiff for the OP's set up. If he wants to shoot the 300 he will need to retune his bow. Even then proper arrow flight may not be possible. You ca not shoot 2 different spined arrows out of a bow and have both tune properly. Pick one make and style and spine of arrow and shoot it. That is my advice for what it is worth.
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