This morning I spoke again with Umicore, particularly about the loss in the new pricing scheme.
Umicore now say that they can recover more than 90% of the gold from plating baths, rinse water, and racks, including refining fees. I assume this also applies to the Pd.
This means that the loss charged should be a lot less than 85%.
Can you check with them for the details again? And can Miki also try to find a way to estimate the actual loss you have had historically? This will be the best evidence for setting up a pricing formula.