No actually, it is not.

I don't know about other jobs, but I found leves on Armorer to be EXTREMELY INEFFICIENT!

You have to remember that when it comes to crafting leves, you are realistically turning potential gil into EXP. Those materials used to make the leve items can be sold on the Market Board, and usually DO get sold for quite a bit! But instead you're choosing not to do this in order to get your crafter leveled up.

This is the name of the game, and the other alternative is crafting collectibles. In terms of EXP gained over gil spent, collectibles were a FAR BETTER source of EXP. Maybe that was just for armorer.

Anyway, the point is, it doesn't really matter if it's overtuned or not - even if it was HALF what it is now, people with hundreds of millions of gil will still spend what it takes to get that easy EXP and have their crafter leveled up.

The only effect reducing leve EXP will have is putting a strain on poorer players. STOP IT!