With time, there has been a gradual and steady increase in the rate of iron per unit cost. There was a time when the cost of iron per unit was like 2-3 or Maximum 4. But now it's like 7-8 and in some cases even higher then that. I am suggesting to decrease the amount of iron consumed for crafting an armor from 250 to 200 or 150 if possible.
This will effect not only the prices of iron in F7 but will also make it possible for most people to actually feel easy to craft an armor with less iron resource needed then before. That's all.