The more I watch Gallo try to do other things offensively the more I realize that he's got to relax. He tends to rush his shot attempts when he goes to the basket, often lurching forward rather than going in strong and balanced. His pull up jumper also lacks any form. When he's close he tends to want to fade away, which isn't necessary and throws off the shot just enough to miss what should be an easy score. He's great at drawing fouls, but he could finish better with a less off balance and stronger approach to finishing his drives.
To illustrate, he isn't looking for the contact 1st and then releasing his shot. He fires too early, as I said he lurches and makes himself smaller as he leans towards the basket. He needs to go up strong and upright and keep the ball away from the defender until the last second. Chandler does this as does Amar'e. It's a skill Gallo needs to master so that he can actually draw the foul and still score the basket, which he almost never does.