Flint (EMC = 4) + Crusher = Gunpowder (EMC = 192)
Cobblestone (EMC = 1) + Crusher = Gravel (EMC = 4)
Mod version 0.3.507 (FTB Horizons)

This is not the place to post such issues, consider two things:

• It is unreasonable to assume Phimar will check that the mod is un-exploitable with all other mods.
• The EMC values are configurable so feel free to edit them.

Okay.
Can you tell me how to configure EMC values? Seems like configs are empty.

The directory is: [minecraft folder]\data\ee3\energyvalues
The file is called pre-calculation-energy-values.json, you may need to create if yourself.

The file format is not the simplest, you can extract the file [minecraft folder]\saves\[world name]\data\ee3\energyvalues\energy-values.json.gz. It contains a file named energy-values.json you can learn the format from there.

Thanks