I feel like with Steph as with most people whose main weapon is their aim it's a lot about his mental state, which is dependent on his surroundings.
But also the spacing.
When the team is ass, so is the spacing and he is just putting up bad shots, specially when Draymond is out.
But now with another superstar and a healthy Draymond, he's happiness and consequently aim is back.
Looking at this team, it might actually be quite solid, especially if Jimmy can play the defense he used to. 3 elite IQ guys, and 2 (at least formerly known as) elite defenders