Okay I got on the PTR and tested some things out. I USED A PREMADE CHARAKTER AND PVP WEAPONS WITH A SPEED OF 2.6!
For Proccchances I used the Addon Proculas!

Facts:
- If your OB misses with the MH it can hit with OH and your runes are not on Cooldown!
- Rime can procc off both Weapons and so proccchance is something about ~27%
- Single Target: NEVER USE HB! its bullshit
- SLOW/SLOW is the best combination (hello 2x Broken Promise, http://www.wowhead.com/?item=40345)
- You are gonna have Runepower problems, because RS eats much more RP as you hit faster
- Rimeprocc used HB brings 5 Runepower if Talented 2/2 Chill of the Grave
- EJ says that with 21Expertise or more you have the same parrygib as with a 2H Weapon!

Stats:
Used Enemy: Boss Doll (?? Elite, Boss)
Talents: http://talent.mmo-champion.com/?deat...&version=10048 (you can choose between 0/2 CotG 3/3 GR or 2/2 CotG 1/3 GR, dps test incoming)
154hit (4.7%)
26expertise (6.5% d/p)
2 Weapons with 2.6 Attackspeed each (I know there is only a 2.5 Tanking Weapon, but the results should be about the same)

Rotation: IT PS BS BS OB - OB OB OB (FS if KM procced, HB only if no Runes up, no FS useable, and KM)

KM Proccchance (10 Minutes white hits, no specials)
KM 3/5 - 19 Proccs, 1.95 PPM
KM 5/5 - 26 Proccs, 2.63 PPM

KM Proccchance (10 Minutes, with specials)
KM 3/5 - 25 Proccs, 2.53 PPM
KM 5/5 - 27 Proccs, 2.89 PPM
KM 5/5 (with an 2H) - 47 Proccs, 4.62 PPM

I was a little bis dissapointed about this result because there are less KM Proccs with DW?? So another point to use your FS only if KM is up.. and on a single target never use HB (IT SUCKS ON SINGLE TARGETS!!)

And here some Screenshots from Recount.

KM 5/5 no specials

KM 3/5 no specials

KM 3/5 with specials

KM 5/5 with specials




I hope this is helpful to somebody.
I'm going to DW Tank with 3.2 and test things between Blood 2H and Frost DW!

best regards,
Tialol