I've heard this problem before (AI-Walls), but can't remember the solution. Just on the chicane in your 4th pic, you should go to sobjects, then select one of the kerbs, then (in the dialogue box) go to the properties (i think it's a tab) an you'll see 3 buttons - representing straight, curved and "the other one with those little pink nodes" (don't remember the names of those). Pick the latter of those three and then drag the little pink things out (they eill be hidden inside the big red node). This should stop your kerbing from buckling after you fiddle with it for a bit. Also, I think you should do one of the following:
1. Either move the 1st apex's tyre wall and kerb towards where the picture was taken or the 2nd apex's further away.
OR
2. Move the 1st apex closer to the wall.
The reason I say these things is because I think that chicane is a bit slow and tight, a bit like the new Bus stop at Spa Francorchamps. Well, more tight than slow, but I like (and this may go for others as well) Fast chicanes where you can really belt the living daylights of the car out over the kerbs. Maybe not ideal for real life, but this is rfactor, simracing. As well as the realsim, It's also about enjoying yourself, the tracks you drive on and the cars you drive. If you had exactly the same freedom in real life, simracing probably wouldn't exist.
Anyways, you can ignore that if you like, i think my fingers have a mind if their own!:wink:
Basically what I'm trying to say is that I like these sorts of chicanes:
Would love to see a chicane like this one