I would like to know the reason you are making it nearly imposable to play Forestry with your mod installed? 4 ingots (3 copper, 1 tin) = 1 bronze it take a minimum of 8 to do anything in forestry.
You have to use dusts. Really, Greg should remove that recipe with ingots entirely, because it just makes him look bad. Not that he isn't bad anyway for nerfing bronze, but the ingot recipe makes him look even worse.