That's really, really surprising! It almost has to be the coating. Like I mentioned above, I ended up with a ~70 yard "sample" of the Silky and it's by far the smoothest I've ever seen. It's even smoother than Gliss and Nanofil. It feels like...well silk I guess. I feel a little guilty suggesting the Pureline now.
One thing you can maybe take advantage of is that they have a 'no questions asked' return policy if you're not happy. I've gotten to know the guy a little bit just asking about new products and such, and I'm confident he'd stand behind it. Hell, he'd probably even send you a spool of the Silky if you said you wanted to try it instead since you bought the Pureline and aren't happy with it. He's a guy who got really wealthy in some other line of business doing some really specialized manufacturing overseas (I think it was something to do with the aerospace industry, I believe in South Korea) and has created the fishing company as a sort of fun/new thing to do. I don't think it hurts that a lot of the stuff he manufactures as part of his other business can be translated directly to fishing. Either way, that it's not smooth is a shock to me!