usually crafting in anything except mithril isn't worth it, with admantine the miniscule 3 protection really doesn't do much at higher levels. Sure a punch from a basic kobold is noticeable, but when fighting higher level mobs, having 3-6 admantine protection? not really worth the effort. I think it used to be 5 early on and was switched to 3. Maybe at 5 it was good long ago, but not so much now. The best thing to do is use admantine for weapons for your warriors so if you run into a foe with stone-like defenses (golems, etc) and a few others, your weapon can actually punch through to cause damage.
I always make such weapons for my warriors just in case, and the rest for just crafting and re-selling armor for profit, same with the other ingredients. Mithril is very nice you can outfit people in mithril armor for lighter use, and its excellent protection. Useless on weapons.
So for the warrior types keep a pair of iron and silver weapons, enchant them later for your normal use, have an admantine weapons for a few select foes, mithril armor, and just craft and resell items for profit with all your other crafting ingredients. A quick search will show you what the best resell items are for each material.
My warrior might have his 3 greatswords so he can use which ever one is suited for the situation (alchemical silver, iron, and admantine). Again, protected foes are rare that need admantine to punch through, but in those few instances its nice. Usually you are just using like your silver +5 greatsword of acid and holy damage, you get the idea.