Hmm, interesting. I can imagine that plastic is not very elastic and is thus much harder too shape than other materials. I can also imagine that due to the use of a plastic heel counter the leather at the heel stays very stiff for a longer time than on other places of the shoe.
I have the impression that every time I wear my Edgware's (I wear them today as well) the heel slippage is a tiny bit less. However, it's hard to tell if this is really the case or if it's just a psychological thing. But like I've said, I'll give it another month and see from there. This is my first Goodyear welted shoe so I don't have a real reference point on how they should break in. Like I've said before, the shoes aren't uncomfortable at all and even on the heels they don't give me real blisters (just two reddisch spots in the evening), it's just that the heel slippage is a bit annoying, as is the feeling that my feet is not 100% secure in the shoe.
But after my conversation with the C&J store manager I'm confident that the heel slippage will improve over time.
I apologies for my english, I hope everybody can understand it ;-)