Even Distribution in that sense does not exist yet. But I might add some way to limit the emitted Stacksizes on those Exports so you only have up to 1 Ingot in each machine at any given time for example.
You can also use an actual Filter Block and tell it all the ingot types you wanna have inserted there, and then attach a GENERIC Export Cover onto that Filter Block. Everything is nice and Modular 
Edit: Also again mentioning it here, dont put the Storage Covers on the Logistics Mass Storages, thatās not how they work, the Logistics Mass Storages ājust workā without any covers needed.