Quick weapon choice questionFollow

Half awake as I right this, so I'll be brief with more details as needed tomorrow when I'm more awake to see what I'm missing... Anywho, 50 enhancement shaman, currently equipped with:

Hand of Righteousness (56-105 damage, 2.7 speed, 29.8 dps; yes, I know it's a healing mace, I haven't had any luck getting better yet ^^;) main

Skullcrusher Mace of the Bear (39-71 damage, 2.7 speed, 31.4 dps, +5 str) off hand

Thanks to a run of ST and Zul farak, I also ended up picking up

Gahz'rilla Fang (39-74 damage, 1.9 speed, 31.4 dps)

and

Fist of the Damned (47-89 damage, 1.9 speed, 35.8 dps, +6 str, and chance on hit of stealing 30 life from target)

I know for windfury, max dps is done by having the main and offhand weapon speeds being the same; beyond that, I don't know what other factors tie in. Would the higer pure damage per hit of the first combo offset the distinct speed advantage potentially leading to more procs of the second? Or is the second fast enough that I'll be losing too many procs to the speed which I hit, particularly when Flurry activates? For that matter, is there some combo of these four weapons beyond the groups I put them in above that would do more damage, assuming I don't get better weapons before I check for answers anyways? Still trying to learn all the intricacies of shaman melee dd in as much as gear is concerned, so any help in answering these questions will be much appreciated, thanks in advance and all ^^;