Bradley started the season (and preseason) taking a lot of FGs and scoring a lot of points so teams are probably making him some sort of focus in their game-plan.
It's easy to say these guys should take this many shots per game, but it's really a lot more complicated than that. You can run plays for certain guys, but you can't always control where the open/best shot is going to be, especially in Brad's system (you don't want to have a guy force a shot in isolation for the sake of him getting his allotted FGAs).
It's more about how aggressive players are at trying to score. So long as AB is always being aggressive, even if other teams manage to limit his shots, that just means he's getting his teammates easier shots.
Coaches don't tell players, "you need to try to shoot 20 shots per game," they tell them, "you need to try to score 20 points per game, and don't take a shot outside the offense."
Avery doesn't need to shoot more aggressively, he needs to aggressively look for efficient scoring opportunities and then make the right play.