How to Efficiently Configure Working Item Counts From Applied Energistics

Solution 1:

Routers are, in my experience, your best bet here, you can configure one router to pull the scrap out (set the router to extract from a side), and one router to insert the required items (insert into top).

This way you need one Export/Level emitter per type, up to a maximum of 4 per router (technically you can add more per router, but it's messy). If you want more than 4 types of items you can add another router set to insert at top without problems.

This setup would also be easier to expand as you would just need to run IC2 power further and add the block next to the existing system. (http://imgur.com/a/wdnDY)