I'd take a long, hard look at that backstory and ask whether the current story (which is far more interesting -- that's why it's the current story, right?) actually needs it.
A character is defined through his or her actions. What that means is, I don't really
have to know that Little Bobby's stepfather locked him in a dark closet when he was a boy -- his refusal as an adult to enter enclosed dark spaces suggests something happened in his past... and his taking physical action whenever he sees someone frightening a kid enforces this. Must we have it spelled out for us? Isn't it enough that we know there must have been some incident in adult Bobby's past that made him what he is today?
Think of Crowe's tough cop character in L.A. Confidential. When we meet him he's responding to a domestic, where a husband is slapping his wife around. He beats up the husband and sends the wife on her way with money. When he later loses his temper and hits Kim Basinger's character he's as shocked as she is! And driven away from her by his guilt. The script says something like, "The sins of the father are visited upon the son!" -- a rare but perfect piece of "telling" that helps make the script itself a great read. But the film SHOWS us this without having to watch the backstory of the boy witnessing his father beating up his mother.
Of course, if the past is more interesting than the present then maybe that's the story you ought to be telling.
-Derek
Derek's Web Page - stories, screenplays, novels, insanity.