Grandude,
Not to nit pick but KPIX is CBS, KGO is ABC. I've noticed the lip sync errors on ABC with my OTA setup so it might be a station problem, I don't watch alot of ABC except for Lost or if they're showing a sports program. Also I noticed that there are drop outs once in a while on CBS that will drop the signal both on OTA and on my Comcast channel so I'm sure that is a station problem since it happens on both at the same time ( I used split screen on the tv to verify this ). Yes, I'm cable just waitiing for my Dish install.
Laters,
Mikef5