I have been stepping through uninstalling but it kept BSOD after 10 minutes or so. I think KB4556799 was removed during boot recovery option to remove latest quality update. I subsequently uninstalled KB4549951 and KB4552931 without relief of BSOD. Currently restoring save point back to pre-5/11 updates...
Took 75 minutes to restore but system has been running stable for almost 30 minutes.
So now what happens when those patches reinstall? I have it paused until 6/15.