I can't help you too much on your question, but in my experience it seems duel wield isn't very good until your melee skills reach around 150.
You'll be fine to rock your Silver Swiftblade to 30. At this point it may be considering swapping out to a better weapon as the DMG cap is lifted (or swapping to duel wield if you like that look).
I wouldn't worry about trying to calculate a few % difference in efficiency. Parsing will probably be the best way to see what is best.
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