Hi Jim - Some slack should happen when the pull pull is set up properly. It sounds like you might have a little bit to much however.

Here is a link to some of the best pull-pull set up explanations I've found. The [link=http://members.cox.net/bdfelice/Ackerman/ackerman.htm]Ackerman[/link] effect.

Hope this helps a little, it sure did me when I needed it.