Regarding compressed, the default setting might have changed with the update. Just in case, it's worthwhile checking.
About shadow smoothing, it's active in AO, GI and GR.
What about the "Quality Boost" in the light tab, that I also mentioned? The default atmos normally have that in zero, which is far more that what's normally necessary. I normally render at -1.5 or even less (the higher the light balance, the lower this setting can go).