That's amazing. Thank you so much. Glad I could help.

After ~3 weeks away I went to reload an old save. The base game had already updated itself. I first updated all mods that had new updates since the last time I played (11, I do not remember exactly which ones). I then opened the old save game, and the game crashed while loading. The green loading b...

Looks like something changed in the Zinc chain at some point since your latest update and the yield of smelting High Grade Zinc was roughly doubled (it's now 132 molten zinc per piece.) Based on your 3.3 chain, that would suggest that that's now the optimal route, with a yield of ~2.3 plates per ore...