A few tips for the Sebastian Loeb challenge -
First watch the video to learn where to break, where to throtlle and where to turn.
My setup for Chamonix - auto. gear, 1 skid recovery, 2 abs.
What I noticed, is that it's mostly about controlling the throttle in the tight turns. E.g. when coming to a 2nd gear turn, break easily and let dont push through the corner. Let the initial speed take YOU around the corner. Take the corner tight and don't drift hard. Take it easy when steering too. Make small adjusments, find the middle of the road when exiting a corner and when powering through high-speed turns, don't break hard either, easy break adjusments, let the speed come down easy to the right gear and hold the speed, with a small press on the throttle. Always be easy on the throttle.
When breaking hard into a 2nd gear corner, you almost everytime, find yourself comming to a hold, when having to throttle hard out. The hard throttle prevents the wheels from turning and getting a grib to the surface. Therefore, easy on the breaks, let the car drive itself through the corner with its own speed. That way you maintain a much higher speed through the corner and your exit will be much faster.
Much of this applies to the snow challenge - I also used the same setup from the Chamonix stage - when you get the hang of Chamonix, I'm pretty sure you'll know how to deal with the snow challenge. Again, whatching the lap preview did a lot for me.... Take your time and don't stress about it. If you're stressing, take a break, adjust your boxershorts, have cig. a breath of fresh air and come back again, watch the lap preview and don't focus on the ghost car, do your own race.
I golded them all, not with ease, but mainly because I used the lap preview and learned when and where to break, throtlle and turn.
Hope this helps a bit... Otherwise ask
Where you loose speed, which corners makes it difficult for you and I'll see if I can help you out!