Well first of all, Nemesis is far from your typical barleywine. Which year of Nemesis did you have, and when? I don't think I've ever heard this year's Nemesis described as smooth, and last year's was apparently very hot fresh but has mellowed out a lot, so I suspect you may have had '09 Nemesis fairly recently. Also, I don't find porters and barleywines all that similar. However, Founders Porter is very hoppy for a porter. So if the only porter you've had is Founders, and the only 'barleywine' you've had was Nemesis, I guess I could see where you might think they're similar. But again, neither are typical for their style.
Also, I think people's definition of "smoothness" in a beer varies greatly. What exactly do you mean by making it smoother? If you mean less hoppy, I'd go with a Fullers Porter clone. If you mean less chewy, lighter bodied, or drier, you could mash at a lower temp (but see psychobrawler's comment on that above) or use less carapils, or both. Personally, I love Founders Porter the way it is, so I made it exactly as per the above recipe. To each his own though, of course.
btw, I see that you're in StL. Are you on stlhops.com?