Lord Thane Sure that’s a good place to implement the 10% bonuses but you still need to make it feasible for the whole ecosystem, PLEASE consider gnomes to do 4 weapons per forge at optimal, 6 at double optimal
If elves and orcs are to remain at 2(3 at double op) then make humans 2.5(3.75 at double op) dwarves and undead at 3(4.5 at double op)
We may need to provide additional balance later due to undead being introduced, but I think this is totally fair for a starting point!