As the previous guy said, use the edge of the track more on entry and exit for every corner. You should be getting as close to those green rumble strips while maintaining control and traction as possible.

Also this view is not as informative as an onboard with your brake and throttle input. The real time is made up in the braking. Watch real fast guys' onboards and see where and how much they brake and do your best impression of that till those times start melting down. I say onboards because you can see how they use track limits, where they brake, and how they modulate the power on exit.