For the Panny, just take it OUT of Vivid mode and switch to Cinema or Standard. Then, zero out ( meaning center of the adjustment bar) Picture setting and Brightness settings. Avoid black bars on the sides and top/bottom of the screen. Stick with FULL-screen programming / movies.
Do this for at least 100 hours and then break-in will be pretty much good.
Beware the threads are long and it will take several days to find specific answers you may have on this set. You can always just ask at the end of the thread; you just gotta be sure and remember which post # is yours. Otherwise you'll get lost in the rediculously long thread (cuz it's a popular model).