I did notice that i had to improve my braking when i watched the video myself. I did try third a few times earlier on, but with the power of the Beams at the top end of the rev range it seemed better in second. That being said, i only tried third when i was still learning the track, and i'm now probably carrying more corner speed with the improved confidence that i gained throughout the event, so carrying third makes more sense now.
I'll have a lot better tyres next year as well (assuming you allow 17" wheels and tyres in the street class lol) so i'll have to use third anyway with the expected improvement in corner speeds.
Thanks for the feedback - I don't really know what i'm doing lol.