I'm wondering about this myself. The best I've heard is to equip one and hotkey the other. Or maybe press the equip buttons at the same time? I want to know too, so I'll stick around.
Yes, I had the same problem with dual (fine) elven daggers. So I switched one to a (fine) dwarven dagger and I was good. My friend had the same problem with dual identical steel weapons (not sure on his weapon type).