It can help to tilt. It can also help to beef up one side of the saddle with extra padding. You may also just be able to split the difference and not feel too bad.

There's a real expert on this fit issue at cyclingnews.com on the fitness q&a page (Steve Hogg). There are gobs and gobs of questions and responses geared towards functional and measurable leg length discrepancies of various amounts with various ways to tackle the problem. You can get a lot of good information there.