Just in case anyone else finds this:
After some back and forth and testing with Elliot, the 5.5.8 release fixed this.
One note about the responsive side of things, though. You have to set the embed width in the field settings to your desktop container width even with the responsive video wrapper code applied. Unlike other oEmbed sources, like Youtube, etc… that will go to 100% when the page loads when wrapped in the responsive styles no matter what width is specified in the settings, the Facebook embed requires the correct embed width, but once that is set the responsive styles will work for lower breakpoints.
