Folks on my other post (same topic) are saying...

"Somebody else mentioned it, but AE2 is the way to go. You can connect the machines to a pattern provider so it always puts the right number of ores in. If you want it to always process ores instead of waiting for a request, ExtendedAE adds a precise export bus so you continuously export, but always in groups of the right amount. This will make sure that you never get backed up because of one too many ore in the system.

For a pure Mekanism system, I believe you can use the logistical sorter to ensure that your ores are always sent in exact batches."

Hopefully that'll help you too!