Are you consciously thinking release now?
If so...I would recommend working on a subconscious release where it happens naturally and isn't forced.
Your arm is moving reward so back tension is indicated.
Try practicing on a blank bale and see if you can feel a release where the hand moves straight back instead of out away from the face.
When you can feel yourself doing that...than see if you can duplicate it by shooting at a target at clost distance.
If you can't repeat that feel every time...go back to the blank bale until you have mastered that aspect of your form.
Ray