Just revisiting this thread. I have been checking periodically since I made this post and AA for at least flights from NYC-> LHR has never fallen back down to 57.5K again for business flights on AA metal. That's about four months. Not a big deal but if you are out there writing blogs about the wonders of AA miles and how sweet spots is flying on amazing AA metal to Europe for 57.5K, time to change the blog.
57.5K is available on British Airway metal, but the fuel surcharge on those are egregious.