Glad to hear you are having no problems. Mine has a playfield stamp date of June 14, and a manufacture date of July 8th. I received my machine on July 15th and so far have no issues with Ghosting. K3V on Klov and Pinside also got his the same week as mine and so far has no issues.
On the flip side we unboxed an LE this weekend with an August build date and it had insert ghosting out of the box. Of course I don't think the manufacture date has anything to do with it and its more about the playfield stamped date. No idea what his date was.
I hope no issues show up for us and I really hope that Stern ultimately makes it right for those that do have issues.