Video doesn't help it makes you look 4 feet wide and 2 feet tall. I presume you are talking about your bow arm since you mention your grip on the bow.
Be sure that you have not or are not locking your elbow. It should be straight BUT NOT LOCKED!! Entire bow arm should be as relaxed as possible. Just a little tension in the triceps to keep the elbow straight, BUT NOT LOCKED.
From what little I can see, you do seem to have a sharp "punch" at the target when you shoot. Don't PUSH the bow towards the target, just point the bow hand at the target and let the entire arm feel like a solid brace between your shoulder and the bow grip. Think that your bow arm is a solid 2X4 braced between your shoulder the the bow.
Arne
PS see if you can address the "wide screen/normal screen" width on your video.