Well, when I set it at .7 inches and then have it check at .5 inches, what would you call it? The only thing that makes sense for me is that I had originally set it during winter temps? Though the main point is still that the tightness of the belt does relate to how noisy it can be!
@wjfyfe, Bill, something else to look at is make sure your ride height on your swing arm is still where you want it. If you have stock coil overs the spring could have collapsed. If you have aftermarket make sure the adjuster is not loose.