Holy shit why is automating Ad Astra steel so difficult? Neither Create nor AE2 interfaces with the machine so I had to go with hoppers, but the hoppers pull from the input first and overflow input items to the output.
I have never encountered this before. I had to break out the comparators and use my vanilla redstone knowledge.
Basically it ensures the output is too full to accept any input items, and then I use a slice of a vanilla item sorter to make sure it will only pull the output items. What the fuck