I tested dual-wielding versus single-handed and wrote down the numbers which happened. Two tests, ten shots each, (40 shots total).
When dual-wielding, both wands were in about the same approximate damage range, which was clearly a lower range than single-wielding. If only the offhand had a penalty while the main hand had full damage, then I should have seen higher damage with the main hand compared to the off-hand, about at the same range as single-wielding. That was not the case.
(One of these tests was with Wands and Dual-Wielding at 1 and the other was with Wands and Dual-Wielding at 0.)
Last edited by Stabbey; 06/11/15 01:56 AM. Reason: additiolna detail