I really feel for you Lena. I know just how frustrating it is to get something and sit there looking at it, just knowing in the pit of my stomach that something wasn't quite right. I think that due to the newness of your current Grand Wega it probably would be best to go ahead and check with Sony to see if ISF certification on your TV would in any way jepordize your warranty. I personally don't think they should have a problem with it since you are only trying to get the best from their product, but then again big companies can get big ego's. If I lived anywhere near Dallas I would gladly come over and peruse through your TV's service mode to see if there are any setting that I am farmillar with on your set.

Here is a list of trained ISF dealers with calibration equiptment in Texas, on the ISF site.

http://www.imagingscience.com/isf_search.cfm

I know that technicians of this sort can be quite pricey and again wish that there was any other way that I could help you out, but I am sure that if anyone can get to the source of your dilema, it would be one of these people. I don't know where in Dallas it is that you live but one place on that ISF list stood out to me and after researching a bit more feel that he seems to be a pretty straight forward guy with a desire to do his best to get the best from your TV. His company is called Custom HDTV Calibration, and his name is Larry Proud based in Mesquite (a suburb of Dallas?). Larry also has a web site:
http://www.angelfire.com/tx5/lproud/1mywork.html

If you go to his site, he has price list's, his background and the reason he started his business in the first place listed, which was what caught my attention. I would normally not recommend someone I wasn't farmillar with, and you may want someone else, but at least it's a start. I have also emailed him concerning your problem and hope to hear back from him in the next day or two.

I truely hope that you are able to get your GW up and running to your satisfaction soon, and hope you have a great day, Lena!

-Jeremy