People often track too tight because it looks good when it's large type at a close distance. However, this is absolutely terrible for legibility in real life conditions where you either look at small type from close or large type from far away.
Hi, I just wrote to you on Twitter before seeing this thread. I agree with you here, but the issue is that your default setup is close, large type :) Zooming with the browser does indeed help. Perhaps you should call attention to the fact that one can do that?