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					Originally Posted by  eqravenprince
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				I also assume that off hand fires off each time the delay timer ends. 
			
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 Each time the delay timer ends on the offhand the duel wield check is made, if successful then you swing, other wise the timer starts over. The higher your skill the more likely you are to swing with the off hand.
http://wiki.project1999.org/index.ph..._Attack_Chance
If you're trying to create an over arching formula, you also need to take into account misses which will vary greatly depending on your level, skill level, and the mob's level/stats.
I would highly recommend downloading gamparse and just parsing your fights and looking at those "real world" results.
You are correct that Adamantite Club is better in primary and SoS in secondary if those are the two weapons you have available.