Weighing more than 3 variables against each other?

So, I've been setting up systems so that my factories can essentially "order" materials from the core. This is especially useful on maps that don't have the resources you need. For efficiency's sake, I'm attempting to have multiple factories fed from a vault, which receives shipments from the core via payload launcher.

The problem I've run into is that once I've calculated a numerical value for each material (using the factory's production cost and the amount reserved in the vault) I can't weigh more than three against each other. I was using "lower than" Jumps to find the lowest variable, and write a corresponding order to send to the core. However, having more than that adds a lot of Jumps that aren't touched by the processor, which tends to favour the two variables weighed by the first jump.

I might be able to figure it out with more Ends, but it's tedious and confusing to look at. Are there any Operations that can help pick the lowest variable?