Offhand has its own timer, and no damage bonus unlike mainhand. Therefore, if you have two equal ratio weapons, put the one with the lowest delay in mainhand to get more frequent hits with damagebonus (its independant of weapon damage). Basically, only ratio matters when choosing offhand weapon.
Procs happen on an average per minute basis, and its the same on all weapons regardless of their delay if i understand it right. If i recall, offhand should proc about half the times of the main hand.
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