1. Last night I was using [item]Khorium Champion[/item] with +7 weapon damage to test out the Proc + 2H Sword Proc + Windfury. Mainly to see if I got a damage boost from [item]Gorehowl[/item] with Executioner (with Axe spec)
2. I think the 990 DPS might be skewed upwards, mainly because on the ad phase, I usually spam Trinkets, Death Wish, Sweeping Strikes and Whirlwind. At that point, I am pumping out around 1400 DPS
My damage is spikey at best. Sometimes when things are proccing and flurry is going, I can pump out around 1200, but on some rage-starved trash pulls I'm 400-500.
I'm by no means an expert on 33/28, but I've done a lot of research on how to be one, so I'll take a crack at it .
The first thing I noticed about your armory (not so much the WWS) is that your weapon is pretty fast. Combine that with your Haste trinket, and I think you'd run into difficulties with you rotation (when flurry goes up, your CD will be borked...). I'd suggest switching back to Gorehowl. Having spent my last Kara run windfury-less, i've found it's really nice having white hits that can fuel a Slam and still leave you with a little extra rage; that high top end is key. While that doesn't matter so much when you have Windfury, it should up your damage when you're getting unlucky.
Your Executes are hitting for some pretty massive amounts... how much rage are you using for those? Consider that you might get more dps with your regular cycle - try working execute into your rotation if you haven't already (e.g. Slam > Execute > White > Slam > Execute > White).
Of course, I don't think that applies when Recklessness is up and the Rage is flowing like a river
I tend to agree with shiz a 3.3 speed weapon wont truly allow you to see what the spec is capable of if you are trying to do it with a slam rotation.
That being said one MS warrior from Blood Legion (Illidan server) who had WWS showing as high as 1900 dps on a couple of different fights was stated that they didnt use slam in their dps cycle at all. T6 + 3.5spd weapon + other haste gear made slams basically impossible to time and actually lowered overall dps. Instead sub in HS for hard hitting good times.
If you have 2 fast onehanders with reasonable DPS (80+), you should try once to switch to those and spam execute. Your executes will be hitting for a lot less, but you will be doing a lot more damage in the end probably.
Honestly, I don't mind giving up [item]Khorium Champion[/item] and dusting off [item]Gorehowl[/item] and adding my 5 points to Poleaxe Spec.
It seems like when I start my rotation, things start to happen very fast and usually I fall behind on my rotation (read: I get behind my on my Slams). I'd post the WWS from Void Reaver but they make me look like a noob (well, I probably still am)
If you don't mind spending the time PvPing, the S1 weapons will get you some nice +Hit and DPS, along with a slow attack speed. Granted, it's a lot of AV grinding, but if you can take it, you'll have a nice weapon for quite some time.