One of the things you may have over looked - the picture on your flat screen television is likely to change as the television heats up or as it over heats.

The only way I have found to prevent this is use a cooling system on your television - a cooling system will give you a constant temp of the inside of you television for determining the the best picture and keeping that best
picture.

I have used it on all 3 of my televisions, the cooling system so far has prevented burn in to the television my son uses for his games, the main television has been nice and cool with no heating or over heating issues. the fan turns on at 90 and off at 88 degrees. The whole systems runs off a thermostat and the bracket keeps the dirt and dust pout of the inside of the tv.

to me it looks like I have a better picture, the tvs will last longer and the system is relatively inexpensive and an easy install only 3 pieces - very happy with the performance of all of my televisions -