At that level personally I would stick with dw unless you can afford to regem and reforge twice... My DK is my alt so I wouldn't but otherwise it probably is worth it in terms of pure dps. Then again you lose some aoe damage by going 2h which a lot of fights rely on. Up to you though, more single target or less aoe. I'm not an expert though so take it how you will.
Use something like ReforgeLite/AMR to get the correct stat values without reforging then run that versus your current setup using Sim Craft (you can manually edit stat values on profiles). Reasonably quick and easy way to test for differences in setup.