You could try going to look inside/low post, but I think the answer is more complicated than that.
Players will take the best available shot so what you want to do (assuming your centre and SF are in fact your best scorers) is ensure that those two players get the ball in a position where they can get the best available shot in the possession. Part of that would be to change tactics, but another part of it is to ensure that your guards don't have higher shooting skills so that they don't take early shots in the clock (I think), and to make sure that the team in general, and your guards in particular, have high passing and handling to increase the team's offensive flow.
I may be way off base on this, but in my few seasons I've come to believe that controlling the flow of the game is the key to winning.