I think his free throw shooting is psychological, however, his jump shooting clearly isn't IMO. His jump shooting goes awry because of his footwork and lower body mechanics. He has done a lot to fix these, but when he is not shooting in rhythm, he regresses to his old, bad habits.
I do have some hope he will improve though, because this type of thing really takes time to change, because its all muscle memory. If he can maintain his footwork, then I think he could be a much better shooter this year.