Reread your post: "... into a bronze ingot ..." That's right, you get one bronze ingot out of three copper and one tin ingot. That's a 4:1 ingot ratio, consuming three of the ingots to return one ingot, right there. If I recall right, from playing earlier versions of this pack, there are Gregtech recipes that make more ingots out of the same number of ingots. In most other packs, you get a 1:1 ratio of input ingots into output ingots. Not here, you get a quarter of your investment back.suggestion: removal of the "three copper ingots, one tin ingot" into a bronze ingot. make people grind them into dust, mix, smelt.
copper and tin into bronze is the only ingot-based ingot-resulting recipe i know of, and have seen (and have gotten to)..start a good habit, go the dust route, ingot mixing not being a direct option
The balance here is that yes you can get bronze ingots if you're in a hurry for them and don't care about wastage, but early-game, you would care quite a bit about wastage of ingots because the Bronze Age machines are so expensive!