I adapted Sharpshooters ENB because I had exactly the same problem. After endless trials I finally found out that - at least for me - SkyLighting wasn't used at all by Sharpshooter, turned it on and the shadows got transparant again. Of course then further adjustments (ambient/direct/point/sky etc.) were necessary to balance the look. In the end I uploaded what I reached to Nexus, cause I thought some people might have the same problem, here is the link: http:\\skyrim.nexusmods.com/mods/44034//?
Maybe you just try it and if it doesn't work you know it is definetly not a problem with the ENB settings

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PS: ..mh that may sound like advertising for my mods, but I really just wanna help
