Duel wield/double attack percentages/code? (warning: mathy)

[Elements]

I havent been able to find any accurate information about the way 2 hander damage bonus is applied based on level and weapon delay for this server. That makes it difficult to compare 2h to dual wield by level.

I also find it a shame that lammy main hand wurmy offhand or JM mainhand wurmy offhand both outperform ranger epics and similarly warrior epics at 60 for raw melee damage (assuming you can maintain 40% item haste w/o swiftwind) based on main hand damage bonus and weapon ratios. Perhaps the dual wield chance skews this based on mainhand weapon delay?