Some very good advise above.

One additional thing you can try is to draw, aim, settle the pin and hold for a few seconds and then let down. Don't release.

Do this exclusively for at least a week then 10 to 20 times at the beginning and end of each practice session.

You will be able to figure out how often you need to do this by how you are shooting. Any time you find yourself doing the drive-by thing, go back to this and these other techniques.

Mikey is right, you can learn to shoot a back tension release. It is not hard, but it helps if you have some help at the beginning. Also, you can learn to shoot any release with back tension. Some of the top target shooters such as Michael Braeden use a wrist release. However, it is much easier to learn back tension with a release designed to be used this way.

Good luck & let us know how you make out.
Allen