Cal Fire has just updated the effected area map.
It looks like the fire was stopped west at Quail Drive, about 3000 feet from the Llama vineyard. The wind would seem to be moving it South into the Canyon that cuts between Pine Flat Road and Felton Empire Road. That is very dense forest, with no roads or access. I'm not surprised that containment numbers are so low. In that canyon, there is nothing to do but let the fire burn until it reaches a road where it can be stopped.
It looks like it's moving towards Empire Grade, which is a fairly densly populated area. I would imagine that containment efforts largely run along Empire Grade, Quail Drive and Warren Drive right now.