When you're ADS and strafing your aim is thrown completely off where your scope is pointing. Have you taken that into account? Pretty much every instance in that video I saw had the person moving/using a rifle with crazy recoil.

Either way, I have never experienced this problem myself. It may just be a problem with your ISP/connection. Things like this CAN be isolated. I don't have many issues with laggy games (people warping around) in GRO, but lots of people complain about it on the forums.