i've tried
(since it seems i can't post links... and i'm not going to post 1-5 word junk posts)
link 1: hardocp's "tweaking skyrim image quality" article page 2, (looks better to me than the nvidia site post. even has before/after pics and framerate measurements)
link 2: @reddit: "[Mod] ESSENTIAL INI Shadow fix to remove blocky/jagged effect! /w pics"
in incremental stages. the overall behavior of the shadows really didn't change.
i will take a 10fps frame drop (from 35-40ish) if only the shadows were smoother and blurrier.
i even took it a step further and tried the ram tweaks of nexusmods post "INI Tweaks" ~ page 90 ... which really just jacked things up the most. maybe those would help if you used more memory intensive mods (like graphical improvement)...
edit: re: my complaint about shadows to Bethesda:
We're sorry to hear that you're running into this problem. Please try updating the STEAM software and the game with the latest patch, if the problem still persists, await the next patch, it most likely might resolve the issue.
heh. I'M TRUSTING YOU ON THIS ONE, BETHESDA!
edit2: seems the workshop mods are mainly to make more dynamic shadows at random parts...