Actually, most people think non-color neutrality has better lookahead, since they're always looking for one color instead of alternatin between six different colors.
Does speedcubeshop still sell replacement pieces? I remember them doing it a while back, but I couldn't find it on their site.
Has anyone used White Lightning bike chain lubricant for their cube? It says it has no petroleum and I read on the manufacturer site that it is safe for plastic.
It was the epic ride version of the lubricant that I thought might work best.
A few of my ZhanChi's corner's are like that too, but probably not as much as yours seem to be. (Just getting the impression that they move a lot) I say it's nothing to worry about.