Ancient thread, but good driving, especially on the PSS! Looks like you can carry a bit more speed through 3-4, which tends to have the biggest effect on lap times -- the essses after them are just a glorified straight.
Thunderhill West is easily my favorite track in CA, it has such a nice rhythm to it. I was stuck in the low 1:30s there for a fair bit of time in my M240, until this weekend when I finally started dipping reliably in the 1:29s. Looking at the data, there's at least a couple more seconds in this setup, ironically in the "throwaway" corners (5, 8, 10).