What type of "fluffy swirls" are you looking for? I find if I thin out my BC I can get a nice swirl on my cupcake while using the larger star tips.
Carolinagirl I am looking for an effect similar to the cupcake shown at this blog
http://www.cakejournal.com/recipes/white-meringue-frosting. On my last cc's the bc had rough edge to them. Perhaps it was too thick?
Hmmm that did not a pic of any cupcakes... but sounds like yes maybe to thick, try thining it out and see if that helps.
I couldn't find it in your link, but a tsp of very hot water works in every kind if frosting. Just add until it works for you. It will then stay in that shape as the water comes to room temp. I don't have to do this to European buttercreams, but on those, it's a trick to make them shine.
Here is a picture from the website just in-case someone knows of how to achieve this exact consistency ... no idea why it didn't work from the original link but isn't it purty 
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IMO, that looks like it is a whipped cream frosting and that is why it has that nice swirl to it. I still think you could get something like this from thinner BC and the right tip.
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