Yeah, the only thing that might help is reducing brightness. I found that tilting my panel towards the couch (by propping the stand 1/2 to 1 inch in the back) greatly reduces the noise, but that may not be practical for you.
If it is audible over the TV speaker from more than 10 feet or so, and you are persistant, you might be able to get them to swap your panel. Just report the problem to Samsung, go through the troubleshooting and then they will let you file a service request. There was one person in this thread who reported that repair did in fact fix the buzz, but I think he may have been lucky. Seems it is still a luck of the draw situation, so you could potentially end up with something louder (that has also been reported after a panel swap).