AHH well... arms lore has no effect on enhancing. Which is too bad.
However, I did notice while on Test Center, that if you first make armor with plain materials then enhance, you end up with the same total overall resist, but those resist points are distributed more evenly than if you were to make the item with premium material in the first place.
What I mean is, make leather gloves as a human, skills 120 tailoring/100 arms lore, you get total resists of 35. Enhance with barbed leather you get 47 total. But you likely won't get the highs and lows you normally would see making it with the barbed leather in the first place. It's because you are rolling the dice twice. So if you wanted more even resists, you would do better to start with plain material then enhance... however you are going to have a high rate of failure enhancing and fewer pieces in the end.