Ash, I am sorry that you are having problems with Chewy. But I am glad to hear that you have found something that may work.
As Parnon said, there is no such thing as a perfect dog or perfect person. Don't worry, all our dogs have had their moments. Drake was and can still be a handful at times. Be patient and if your problem persists, seek help from a behaviorist. That is how we got Drake's aggression under control.