Don't mean to derail the topic, just a quick comment:
I noticed something odd in your video, why are you braking in T4? (left hander on the esses) No need to brake there, you can carry a lot more speed through that turn.
Also, if you're willing to try new lines, next time you're out there notice the patch of dirt right before the T4 apex strip? Put your front left through it and make sure your rear left stays on track, between these 2 changes you've gained another half a sec per lap.
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