The reason I mentioned the Weekly Optimization Storm Knight was because that was a build based around wind abilities, and had a way to increase the saves on the build. From what I can see, there's no TWF feat chain in there to net the additional 3 attacks you're stating.
In any other build, you're looking at DC10 saves. Depending on the power of the opponent, there might be functionally very little difference at that level between DC19 and DC10 (it's +4 Constitution and 10 good Fort Save HD/Classes). Control Winds allows you to pump that to DC25-28, I forgot to mention that, although of course, Hurricane Force winds or Tornadoes are more likely to cause more damage than simply the fearing of your Pandaemonic Weapon.