How old are the speakers? Are they basically brand new. I have Studio 80 V2's which have the same tweeter. I thought they sounded bright when I first got them. The tweeters calmed down big time after about 100 hrs or so. i also have a Denon receiver (3801) which I thought sounded a little on the bright side, I added a B&k 2140 to run the 80's and found it much smoother. Now they aren't bright at all. I even notch up the treble a little now and then.
I have heard that the Studio V3's are brighter than the V2's, may take longer to calm down.
Have you talked to your dealer about it? what about room acoustics?
Don't give up on the speakers if they're really new. i almost did to and am now SO GLAD i didn't.