All my suggestions about setup and moving through the swing are "ideal" or "it would be preferable if" you could. No one (me included), can be a perfect model. Theses suggestions all "help" in their own way and combine to make the swing more repeatable.
Now, there are many different body types and shapes out there and you do what you can. In your case (speculating), you might not know that the back elbow must bend some on the backswing and you're trying to keep both elbows pointing back and "straight" and that is restricting your backswing... so make sure you let it bend. Now, if that is not the case... the front elbow pointing back "at impact" trumps all ! ... so if you can focus more on the front elbow only (at setup and impact, or at least at impact), it should help you... again (speculating) without knowing your specific issue. You may not need to worry about the elbows at all and still enjoy my method. Nothing is in stone. FYI... the elbow pointing back at the front hip through impact, helps keep the club face square and prevents the "chicken wing" bending out past impact that causes many issues .... mostly going right for a (right hander)
Move Less ... Get Good! DUPLESSISGOLF