Find the boolean value bDrawShadows=1 within SkyrimPrefs.ini and change the 1 to 0.All Shadows will be turned off. You will get a boost in frames as well. Ultra shadows kill performance for me and look ugly I agree especially off character faces. They seem to be bugged or are using a a complex shadowing algorithm.
Hopefully the Guy who did MGE XE comes and rewrites the real time shadows in this game.