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According to enex, you can't deal more damage than if the target had no deflection/shields. If the target is not using a bubble, 67 penetration rating is all you need to deal full damage to fully...

^ The same was with old HC, when it healed on poison and unholy damage - 200% invul to both.

Yes.

Since the message would be to short: when dual wielding, keep the weapon with highest base dps in the right hand (left gear slot).

IIRC they've changed it to 75% somewhere in 2009.