Rotate your bow arm so that your elbow is parallel to the ground.Put a little more bend in your bow arm so you are not totally locked out.Try raising your brace hieght by twisting your string up a little bit.Get a good armguard.work on it.you dont really want any string slap on your forearm.You will get a cleaner, better feeling, quieter shot and not wear your servings out as much
You might try moving your head over to the right a little bit and cant your bow a little bit as well.Say 1 oclock to 7 oclock or a tad more.Just work it out till you get get good clearance and begin avoiding the string slap.