well after less tinkering and more playing , I have come to the conclusion that I was getting too picky, yes the shadows can be highly distracting especially in flotsam during the day (underneath swaying trees casting shadows onto the ground)
but In darker areas very hard to spot, and easy to forget.
I have found enhancing aa super sampling with edge detect through Radeon Pro or even CCC can help reduce it somewhat , but not really worth the trouble.
16xaf does improve the textures in a big way, but unfortunately not the shadows.
after spending too much time trying to change the way the game looks.
I think it is better to invest time in actually playing the game.
And a very good game it is!

5 years later, and this crap is still present :(

I've gone through settings and half the internet trying to find a solution, but apparently there isn't one. Such a shame. The game looks gorgeous, so why slap these butt ugly lines all over the place? Like letting Mr Bean loose on a great painting.

It's everywhere as well, so it's not like I can just ignore the darn thing. Maybe part of the consolification of the game. Very disappointing. Not bought Witcher 3 yet, but I hope they didn't make this colossal blunder again.