Rate = 17.14 = 120/7
No. of outputs = 7
No. of pairs of reagants used = 9*6 + 6 = 60 

Notes:
The main pipeline uses 6 pairs of inputs to make the core, followed by another 3 pairs to cap off both ends with rows of iron, generating 3 excess lead per product. After 6 products, there is enough excess lead to make the two iron rows by purification, so only the core is made from the main pipeline for the 7th product per loop. Don't know if this is the fastest method, but happy to have finished a wasteless solution. Fortunately, there is minimal confusion over the placement of quantum bonds for this particular product.