Ah, just two more notes: There are many reports from users from "Non-SO" countries which have called Kindle CS and had the SO disabled. Some were charged $20, some reported that they didn't have to pay. So I suggest you just call Kindle CS again - they definitely *can* manually disable the Special Offers, don't let them tell you otherwise.
And to something completely different: You probably still have many patches installed which only work on FW 5.1.2 (they're not functional on 5.3.2). I suggest to uninstall and re-install JBPatch