Erratic winds delayed plans to set the fires Monday and Tuesday.
Officials say fire activity is dimishing but the flames flare-up at night because heat is trapped near the ground and humidity plummets.
More than 400 firefighters are working to build containment lines on the arson fire's eastern flank.
The U.S Forest Service says, ``They've got one foot in the black, one in the green.''
The blaze is now 60% contained after blackening 250 square miles of Angeles National Forest.
Two firefighters dies in the blaze and 11 more were injured.
Nearly 80 homes, two commercial buildings, and dozens of outbuildings have been destroyed.