The problems are clear: consistent shooting and control of tempo.
Bell and AK are obviously the first to be moved around for these reasons (and, I suspect, for a few subtle reasons, e.g. the egos of Sap and Al). I've already come out and said that I'd move both of them to the bench, starting CJ and Hayward. I'd soften this and settle for CJ, who would start in front of Bell.
The substitution patterns are also in need of adjustment. I'd take Jefferson out earlier than he has been and spread out his minutes against the opposing team's second unit. This, again, gives us an advantage on the tempo side of things: let the second unit run-and-gun when possible; dump it down to Al on the half-court sets.
In this vein, I support subbing Al back into the game for the final two minutes of quarters. Tell him to dominate on the block. One thing I've liked about the Spurs rotation this year is that they seem very keen to control the end of quarters. Their sub patterns reflect this. We don't seem so keen. Say what you want about Al's struggles this year, I'll put my money on him against any backup 4 or 5.
IMO, we're seeing too much of a REGULAR DIET of RPrice and RBell. These guys have indisputable value to the team, but they should be used SITUATIONALLY.