First of all, your set is bad, so you should download a proper one at
http://www.setupgrid.net/ or
http://setupfield.teaminferno.hu/.
Also, you're not using decent lines. I know that it's difficult to have a good idea of a track in 10 laps, so if you want to improve them quickly before the test event you should press "4" ingame to have LFS' idea on the question. Anyway this should only be used to learn the track, because they're pretty wrong, especially on the first section and on the last three corners.
More generally, don't be affraid to climb the curbrs. I know, they're extremely high, and they can roll your car as you saw, but 1) this won't happen with softer suspension settings and 2) you'll be automatically pulled off if you don't do so.
So, train, again, again, and again, to get faster times(your offline PB is 7.5 slower than the official WR, and I think that the whole pack will be grouped on 2-2.5 seconds on the MMS cup), anyway I'd say that this may not be a good idea to sign-up on an event only 2 days after you get S2, as you probably won't have enough time to get a proper idea of the whole thing until the race.