The plaintiff didn't "prove" "$0.99 in actual damages per song", or any other figure, for that matter. It was in fact the defence that brought in the expert witness who demonstrated downloading the song via AmazonMP3 (this turned out to be counter-productive, because it showed just how easy and cheap it was to behave legally).
Let me say that again: Plaintiffs did not prove any figure for "actual damages", whether $0.99 or otherwise. When asked this specific question by the defence, the plaintiff's experts and witnesses repeatedly stated that it is up to the jury to determine the statutory damages.
You cannot separate the awarded damages into the compensatory and punitive damages, because the jury hasn't given you the information to do so. Therefore your argument on the constitutionality of the compensatory/punitive damage ratio falls apart.
If you think I'm wrong, the right way to proceed at this point is to provide evidence from court materials, not other cases that you think are relevant or your guesses. All the information is freely available, so there's really no excuse for you to be more specific in relation to the facts of the case. In particular, if you can provide me with evidence from court documents that the jury used or was instructed to use a certain figure as the "compensatory damage" figure and told to derive a punitive one on top of that, then you will have proved that you are correct.
Otherwise, you're just another lawyer emitting hot air -- rather like Professor Nesson.