I have got to believe an organization like the Celtics will tear that shot up and rebuild it, but that type of change takes time and remember...
shooting is like archery or shooting a gun, its a repetitive skill based on mechanics and keeping motion in your shot to a minimum. Muscle memory is a big deal with shooting. These are traits and skills that can be learned only through repetition. Smart needs more reps and someone to "fix" the issues. That takes time. Really desire is all that is needed and Smart looks to have the right attitude.
Shooting is not like swinging a baseball bat, which is more of an art.