all of that info is stored in the oreinfo/resourceinfo files (depens on version using)
look for the resource in there (search)
will find a bunch of listis for each that have min & max amounts, etc
you need to change those setting for the runics
Code:
CraftAttributeInfo dullCopper = DullCopper = new CraftAttributeInfo();
dullCopper.ArmorPhysicalResist = 5;
dullCopper.ArmorDurability = 50;
dullCopper.ArmorLowerRequirements = 20;
dullCopper.WeaponDurability = 100;
dullCopper.WeaponLowerRequirements = 50;
dullCopper.RunicMinAttributes = 1;
dullCopper.RunicMaxAttributes = 2;
dullCopper.RunicMinIntensity = 10;
dullCopper.RunicMaxIntensity = 35;
the parts in red for each