| A different page on the same website says 2kg/litres...

Yep. But I cannot find any source for that, or any regulation that has that as a limit.

And I cannot see how it makes sense. It seems to me, with the typical disclaimer, we should treat the copper like typical fiber, in that a high powder to resin ratio should be desired, right?
Chunks of epoxy between copper chucks seem a waste. So would not finer copper be better? So as to get a better copper resin ratio.
Also as thin a coat as possible seems to make sense to save weight, and that only the outer layer is actually useful.
This seems to also point to fine copper?

But I really know nothing. Just thinking and reading.

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