Changing the numbers to kilograms still leaves swords too light by a factor of half, doesn't change that you have a 99.6% material loss rate to forge a sword, and leaves you able to bare-ass naked on your first day in the game carry six hundred and sixty pounds before you break a sweat. It doesn't change the math.

Similarly if weights are meant to incorporate an encumbrance factor, then all large tools, weapons, armor pieces etc should have probably ten times the "weight" they do now. And it fails to explain how a metal ingot is somehow more encumbrance than the [doubtless much greater weight of] ore that it was smelted from. So that doesn't really solve anything either.