Hey mate, have you managed a gold run in the meantime ?
After reading your post I went back watching my replay of this sector and there's two hints I could give ( no idea whether they're of any help though ) :
First is about the mindset. There's hardly any other challenge in the whole game that gave me such a feel of make or break. So put away the least bit of cautiousness ( if you haven't already ) and go all or nothing from start to finish. I really had to force myself.
Second is about gears. After accelerating I stayed in 6th gear most of the time, 5th for the entrance of the chicane and that sweeping left hander leading up to the bridge, 4th gear only for the right hander on the bridge ( second to last turn ).
Good luck ! I'm sure though you're way to good to need a lot of it.