Best way to use multiple induction smelters with AE2

Hello one and all. My current goal is to get auto processing set up with AE2. At the moment, I'm trying to turn my dusts into ingots using induction smelters. I have a single chest with an interface for all of my induction furnaces. Then I have Ender IO Conduits going from the chest, to the inputs of all of my smelters. The pattern I have takes two dust, and one sand and turns it into two ingots. So essentially, I have a chest that get's lots of ores and sand, and it get's turned into ingots.

My issue is, my sand seems to be distributing unevenly. After doing a large batch of iron smelting, I had a stack of sand in one smelter, and a stack of iron dust in another. What would be the best way to solve this issue? Would I be better off just using something other than induction smelters? I'd rather not have to reinvent my current setup if I don't have to... I hope everything is clear.