Let me see if there's anything I can advise from my multiple time attack sessions at Buttonwillow.
What looks like that left hand comming out of Bus Stop, you can gain some time by lifting to about 1/2 to 3/4 throttle and then hopping on the curb. As soon as you hit the curb, go ahead and put your foot down and you should acclerate nicely and follow the car out.
Good job on the Riverside sweeper. It is definetly an aero corner as far as traction goes. Staying mid-track and nice and stable.
Before Lost Hill, use the full width of the track. You paid for the track, why only use half of it?
Lost Hill again. Don't be too afraid of "The Hill". Straight line braking good. You probably could start your braking zone a little earlier, coast in, ride the curb when you hit the apex and floor it out a bit sooner.
After lost hill on the back straight: Again, use the full width of the track. You paid for it.
Mazda Star Corner: Good line, good apex hit. Go ahead and use more throttle
Esses: At the speeds your going and what looks like a more fairly soft suspension setup, you can more of less blow more straight through it. Lesser turning equals more straight line accleration.
2nd from last corner in Esses: Watch our for this bump. At higher speeds, it's one that will unsettle your car in a quick way.
Sunrise: Good braking and good apex. Again, use the full width of the track to maintain momentium. This is a turn that you want to keep your cornering speeds as high as possible as it puts you on the longest straight.