I have a Radeon HD6970 as well, am generally very happy with how the game runs now but those 3 blue lines at the horizon are seriously bothersome, they also go through clouds and stuff. I unfortunately have not found a solution to this yet, seems to me to be something about the way the sky renders on ATI Radeon cards.
I dont know about your other issues.
I run the game myself with everything maxed out, buildings unlimited, and have very little stutters with the latest patch. There is of course the total lack of Anti Aliasing which causes flickering I suppose.
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