I agree, he does get lots of doubles and digs. The solution to both of those, for the most part, is to shoot it without dribbling.
So, I recommend that Haas shoot over 100,000 hooks shots this summer with no dribble. Catch the ball, jump off the left foot, keeping the full width of his shoulders pointed at the rim (to keep his man as far away as possible). Extend his arm as high as possible and just flick it in.
If the other team did choose to double-team immediately when he caught it, then someone else is open, and that someone can hit 3's at 40% or higher.
This may seem overly simple, but I think it is simple. The Sky Hook was never 'figured out'. Nobody can stop it. It was the primary tool of the leading scoring in NBA history.
It just went out of style & isn't 'sexy', which are both really stupid reasons not to use it.
Scoring lots of points and winning games should be sexy enough.