I've set up the Loot recycler to take loot from the alchemical chest and to export to the vanilla chest next to it.
Ender IO version 1.7.10-2.3.0.422
Ender IO Addons version 2.3.0.422_beta_0.10.3.046

It just keeps building up in the internal buffer. Can't pull it out with other mods as well.

You need to press the "get" button. The output slot (lower left) can be pulled out; the internal buffer cannot be.