Did you get your screen professionally calibrated? And can't you reset the service menu settings if you stuff them up anyways?
Sorry not to get back to you earlier shmick, i callibrated the screen with a friend who does the callibrations for stereo supplies in queensland, this tv is not mine i have an nec 61" hd and fujitsu 42"sd as a perk of my job i occasionally take home plasmas to give them a thorough going over.
I normally do this for a week or so, but i must admit, i was surprised at the quality of this tv once properly set up, blue light aside which can be annoying.
there is a reset button in the service menu, but as i said before the amount of settings that you can change in this tv is pretty amazing.
i am surprised that samsung do not take the time and effort to play around a bit more with the settings at the factory prior to shipping, as they would sell a hell of a lot more units.
But as i said your dve settings are pretty good for out of the box, you should give yourself a pat on the back for perservering, to get it to an acceptable level that you are happy with, as it is a fairly expensive investment, and one that will give you value for money in the long run........