Well, you have a over whellming response in favor of forged slug useage. IMO, it is a good idea. While you could get away with Hyper slugs, I think there have been enough posts above to dissuade you from there useage. Dispite what the magazines print. There dyno rooms are a controled test area that fine tune the engines to live with what they have.
I do not have the money for such things and the real world has changing weather conditions and sometimes, really crappy gasoline.