Simon, I think I bought the same set that you have. And the same disappointment with my first fried egg on it. LOL
It's been about 6 months since I bought it, struggling with food sticking to the pan, and have been resorting to using parchment paper between the stuff I cook and the pan. I was okay with that because I like the pans. I'll have them forever.
Like you, I didn't realize that "pre-seasoned" meant that more seasoning was required, until I saw your thread a couple of days ago. Thanks for sharing! My pans are now seasoned to the point where things don't stick to it, no matter how hard I try! ;)