On my Radeon HD 3870X2 I've always had screen tearing in LOMAC:FC2, no matter what I tried. Enabling vsync, D3D Overrider, ATI Tray Tools, you name it I tried it.
Anyway to cut a long story short, I finally found a tool that did the job - Radeon Pro. I created a profile for "simulator.exe", set up the antialiasing etc. how I like it and then changed vsync to "Always On" in the Tweaks tab. Done, no more problems.
There's quite a lot I don't like about Radeon Pro, and its taken me all afternoon to configure it for all my sims but now I am a happy bunny and can finally start playing FC2! :pilotfly:
http://www.radeonpro.info