Watching the video above there is some nice driving but in certain corners the driver is losing a lot of time (T1, arguably the most important on the track, and T10), but the drivers line through the bus stop chicane (which PD should make an invalid lap) is near perfect, though dirty dirty dirty, until PD makes it a red zone i guess it is the fastest way. There are certaintly quite a few more seconds to be gained from the car in the video though.
Those having issues stuck at 2:54, are you using the same settings/tyres as the guy in the video?
I need to give this a try, Its been a while since I got in the caterham, been too busy driving the Super GT cars and the Mustang, Radical and MX-5 on iRacing (at Spa also!)