The setup in that screenshot is not optimal:
- You are reforging haste away in some pieces and you are not reforging into haste on the ones you can.
- There's a pieces that isn't reforging mastery away.
- 780 expertise rating would net you 25 expertise since you are 1 expertise rating away from cap and that would make you waste almost 29 rating points for nothing.
Here's a manually done setup that would net higher DPS:
The way I'm using the site as of late is to just load my profile up and do it manually since I never actually managed to get it to reforge to best possible setup. It does however set your gear and ratings in a way that's very easy to tweak.