This can be fixed with a mod.
If you can't do it, I will
What parameters do you want to set for the falchion?
In general, the problem of blacksmithing is exponential.
More precisely, Math.Pow(2.75...) for e1.7 and Pow(2.95...) for lower versions.
A solution (from me) is to reduce the base of the degree from 2.75 to 2, as in the price of units, each tier is twice as expensive, and not 2.75 times.
Mod cost troop (hire, ransom) and item (tier, type). Option (on/off): 2h only no reduces weapon price, new formula arrows (+tier = 2 dmg or 6 count instead dmg or 10 count), logic wage/tier (x1.4-x2),
www.nexusmods.com