This huge exploit just got to my attention. 

If you recycle gunpowder you get charcoal and sulfur, take that charcoal and sulfur to make gunpowder = huge profit. 
I only have 1x recycle output.

I ended up blacklisting gunpowder.

Glad you caught that, I just tested and came up with same results.

I didn't blacklist the gunpowder, I just added specific multipliers for sulfur and charcoal, and then it work as intended. (at least until the plugin gets updates)

    "Recycle Output Multipliers": {
      "*": 1.0,
      "sulfur": 0.1,
      "charcoal": 0.1
    }

All this urgently needs to be fixed updated, you have to monitor the Recycler

If you want to have input 1:1 output you need to make sulfur 0.2 and charcoal 0.2