AutoCAD Architecture :: Setting Wall Component Cleanup Priorities?

When building wall styles and configuring cleanup priorities for components, what is the methodology?  Do I sketch out a bunch of scenarios of various wall styles meeting each other at Ls and Ts and crosses and whatever, and then try to puzzle it all out: "if I set the outer airspace to 400, then when it gets to this T, the airspace will cut through the rigid insulation with its 600 priority, but will get cut through by the sheetrock with its 200 priority....".  That seems like a recipe for headaches.  So instead, do I just start from one side of a wall (the wall with the greatest number of components, I guess) and assign the lowest priority number (300, say) to the structural component, the highest number (1200, say) to the finish material component, and numbers in between for everything else, and then see how it works, tweaking by trial and error?  The table of priority numbers for various materials provided is useful, but I'd like to have a better understanding of how those numbers might have been derived, so I can do a better job of assigning my own numbers to components that don't appear in the list.

Also, if a wall type contains two components of the same material (I'm thinking of the layers of rigid insulation on either side of the concrete in an Insulated Concrete Foundation system), should those two components have the same priority number (probably not), or different ones (seems more likely)?