Anise takes a while to mellow out. Anyone remember Stone's Belgo-Anise RIS that came out not last year, but the year before? Anise overload. Just opened up the second bomber I bought summer 2011 about a month ago, and while it was still noticeable, it was finally to the point where it was enjoyable.
Also, five full stars is a lot. I don't think I've ever added one full star the few times I've used it. I'd agree that blending by this point will probably be your best bet if the flavor is overpowering.