Excellent, thanks much!

Yeah, point taken, that definitely could have been worded better. My test demonstrates the ratio of MH:OH procs; it shows absolutely nothing about the ratio of MH procs:white MH swings. That's not what I meant and I can't figure out why the hell I wrote it that way.

The point of the test was to debunk the idea that MH proc rate suffers disproportionally to OH proc rate when dual-wielding with a fast offhand. I've seen more than one person say, "I barely see mainhand procs with wf5/wf5, just offhand," and I've usually seen that cited as the reason for avoiding fast offhands. That test was to debunk that particular explanation for slow offhands being better, not to debunk every explanation for slow offhands being better.

Sorry if that was unclear.

EDIT: Ignore this.

I don't get it. You posted completely normal and expected behavior. Windfury procs 2 attacks every time. That's kind of the point.

Wow, you're right, I'm retarded. This is expected behavior. I think I somehow confused myself with a variety of SCT and combat-log replacements designed to show WF differently than the default UI. I'm used to seeing WF as a single combined figure, and I didn't have those mods running when I took these screenshots. I remember even with that mod setup seeing WF procs work differently than expected, but I'd have to update and reinstall them to figure out what I was seeing previously. Because I'm not exactly logging every single thing I do I can't remember what I've seen when, and I've changed around mods that relate to WF a lot lately.

EDIT: Anecdotal I know, but every time I look at it over an extended period of time I'll eventually see WF do something strange - single procs under the default UI, 1x MH 1x OH procs, 4xMH and 1xMH/3xOH procs back in 2.0 with 5/4, and that combined with the amount of times I've changed my mods trying to see what's going on better I'm having a hard time distinguishing between expected behavior, combat log errors, and genuine strangeness.

Regardless, yeah, these screenshots are meaningless, they're just screenshots of WF doing what Blizzard says it does. I'm withdrawing from this discussion until I can figure out what I was seeing with my previous set of mods.

I've done some testing with both in-game weapons & buffs as well as Disquettes excellent attempt to model DPS & flurry/WF behaviour. I initially posted this in on our realm boards but figured it might fit here as well.

I ran 10 runs for each of the combo's with Disquettes tool and the tested the lowest & highest combo in the real world to see the % difference between the weapons DPS. In-game results were close enough for me to accept the results from the model.

Base Settings:
Crit: 22%
+ hit: 16.7%
AP: 1340 (unbuffed & without rage)
There are a lot more settings like glancing, mitigation, spel crit etc but it's the order thats important not the actual DPS.

Weapons modeled:
1. Dragonmaw
2. Gladiator's Hacker
3. High Warlord's Pummeler
4. Searing Sunblade
5. Runic Hammer

Weapons MH buff OH buff DPS
1 & 2 WF & WF 567
1 & 3 WF & WF 590
1 & 4 WF & FT 545
1 & 2 WF & FT 553
1 & 2 WF & RB 507
1 & 3 WF & FT 554
1 & 5 WF & WF 596

Conclusions: RB is crap, FT is reasonable and WF on a slow weapon like High Warlord's Pummeler will outdps faster weapons with a lot more DPS like Gladiator's Hacker. While the Runic Hammer does give the highest DPS, you might just wanna pick up the High Warlord's Pummeler which is considerable easier to get.
The ideal weapon that is still obtainable for most, according to my math the Gladiator's Cleaver with WF produces 602 DPS and therefor is the winner in this matchup.