As an additional explanation, the non-damage component of procs are now limited to 400 aggro per proc with the exception of the epic.
The white damage aggro is damage bonus+weapon damage.
The 9/18 infestation does 9+11 aggro per swing in the primary. In the offhand, it does 9 aggro per swing since the offhand does not get a damage bonus.
Now, with the 2hnder revamp, 2hnders get a massive increase in damage bonus which makes their swing aggro large enough to overcome having only 2 procs per minute vs the 3 procs per minute that you would get with duel wield.
Mind you, if you are using a 20% haste belt and getting VoG, then you're going to do more aggro with the infestation/frostbringer. Also, if you have torpor on you, (which slows you) duel wielding will give you much more aggro.
You'll need something like a CoF or seahorse hide belt (or similar 40% haste) to make the 2hder work for you as an aggro weapon.
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