For what it's worth... Practice does not make you better. If you practice something wrong you're only going to allow that habit to sink in further and become harder to break.
If you belong to an archery club, there should be some good shooters that can help you with your form. Shooters that are top in the state or seasoned staff shooters. Shoot with them and allow them to critique you. Take pictures of you shooting, front, back and side views to see what you need to improve on.
Someone said, to reduce your poundage, if you can do that without creating a lot of slop in your bow, by all means back it off some and shoot comfortably. Read all you can about archery, watch archery videos if you can, and enjoy the greatest sport in the world. If I can help you with anything, PM me, I will be glad to answer any question you might have, if I don't know the answer, I can find out.