Hey I;m making a mod-pack for myself, and have done a ton of balancing, and I ran across RotaryCraft's Configs, and at the very bottom it allows you to change the recipe for the Blast Furnace, but I've done a ton of researching to find out what recipe format he wants. No luck. That's why I'm here. This is what his config looks like.
The recipe changer is at the very bottom of his config.