Thanks! No worries, I'm almost done with this play-through now anyways, but it'll certainly be welcomed for the next one!
Since I have your attention and you're thinking about balance, maybe Platinum & Palladium from Noble Metals also need a bit of tweaking, IMO.
When using K2, there are a lot more P&P produced due to high Rare Metals demands than there are ways to consume them. I had to destroy 4 full warehouses of each about 50hs ago in my current game, since I had no other way to get rid of it at that time, and was space constrained so I couldn't just add more warehouses.
Now approaching end game, once I implemented Industrial Catalyst for the end game builds, it's still accumulating, but a bit less quickly... still, Industrial Catalyst is consumed in such low quantities that in the end you'd need a lot of refining and cracking and such to have enough consumption to compensate the production. Specifically when using K2, maybe if there was a way to produce Rare Metals with refractory and enrichment that didn't produce P&P as a byproduct would help (just make it less efficient than the byproduct recipe,) at least that way you could regulate your production according to the accumulated levels. The only Rare Metals recipe available that doesn't produce byproducts is the very first one that uses the raw ore.
(Perhaps I should move this comment to the Noble Metals mod, not sure.)
Best wishes o/
