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First, thank you so much for your mods, as I got already many hundreds of hours spent on B&A runs. Really loving it!
Lastly, I went deeper into ressources optimizations as I'm expanding in a larger scale with full tech tree.
I noticed something about the Lead Ingot receipes that doesn't really make sense.
There you get the 2nd tier of receipe for Lead Ingot, and the 3rd tier, which is unlocked later.
Comparing to most of the others "last tier" receipes, this is one doesn't really help.
As you can see circled in red, the increase in term of buildings is insane (and I didn't go further into the hydrofluoric acid need). More buildings, and way more electricity.
The noticable highlight is less cost in lead ore (circled in yellow), but instead you got almost the same amount of ore you saved to add as silicone ore (circled in green).
If you're still working on ore sorting, you can't really rely on that lead consumption to reduce any silicone because they are often not tied into intermediate product. And if you are working with catalyst (as I am), silicone is more building expensive than lead, as lead ore needs crushed raw ore, but silicone needs chuncked raw ore.
All intermediate products into the refining process are dedicated to lead refining only, so you can't really even plan using those factory for something else anyway. Including this Hexafluorosilicic Acid.
Adding to that, also circled in green there's a few other things to bring into the process for 3rd tier refining (Limestone, Hydrofluoric Acid...), which make the receipe even heavier.
The oxygen you save in the process in not worth noticing in my opinion as there's plenty of easy way to make Oxygen, and it's often from nothing.
Last point, you get slag from 3rd tier. You need to deal with this to avoid any bottleneck as compared to gas/liquid, you can't vent "as it is". Yes I know, slag means landfill, but the amount it produces is too small to be significant, but it's still there so you have to include the logistic as you can't let it bottleneck.
I don't mind going into more complex receipes for higher-tier, and I usually like it, even if the ressource saving is still minimal, and even if it costs more Watts, but as it stands I really feel the ressource cost is probably worse for the 3rd tier receipe...
So my suggestion would be revisiting the ressources needed into this! I really like the complexity of the receipe, but I really don't see any benefit from using it as it is.
Have a very good day!
OxCD