I'd recommend running your Deathly Hallows discs through DVD Rebuilder with the added AVISynth script lines:
loadplugin("agc.dll")
HDR=HDRAGC(coef_gain=.25, max_sat=3)
temp=mergeluma(last,HDR,.33)
mergechroma(temp,HDR,.5)
The AVISynth plugin can be found here: http://forum.doom9.org/showthread.php?t=93571
It's what I did with my own copies. Makes them very watchable.