For starters, have you tried using a calibration disc?? Or even the built in picture wizard. I wasn't too happy with the picture on my 7600 initially, but once I adjusted things with a calibration disc, it looked much better. Don't use game mode. It turns off local dimming and the uniformity issues will be more noticeable. The only "bells and whistles" I use are local dimming, super resolution and real cinema. Turn all of the dynamic settings and noise reductions off. I use a manual trumotion of dejudder =2 and deblur =4.
Now, are the sync issues with the soundbar, or the tv itself. I think all soundbars are crap personally. If the tv won't sync audio, that's one thing. If the soundbar is off, don't blame the set. Unhook the soundbar and see if audio syncs up with the tv speaker. I'm guessing it will. The soundbar is most likely the issue. Hang in there. The tv has loads of settings and they can be a little overwhelming. Start with a calibration disc and go from there. You can use a simple THX one on most any Disney DVD or bluray. Or the free AVS one. I think the picture is quite amazing once it is set up properly. Out of the box, the backlight settings are way hot. I have a light controlled basement so for 2D watching, I set mine between 20-40. The picture really cleans up, IMO, once the backlight is turned down and the blacks and whites are adjusted.