Does anyone have experience integrating Lean Construction/Pull Scheduling into P6 Schedules?

This a more general question than P6; it more concerns a scheduling issue.  Our company has started several Lean Construction initiatives.  One is implementing pull schedule with our field supervisors on new construction projects.  Pull scheduling involves developing schedules at a lower level of detail than typical P6 schedules (almost at the task level).  We are struggling with having developed a baseline schedule several months prior to field construction and having to further breakdown activities into smaller tasks.  The drawback to this approach, of course, is that you can't track a "revised" schedule (with a lower level of detail than