I don't know many chances I had to get a sub 31, how many times I failed the snow bridge skip, jumping over the volcano, passing the rock or the last boost, I really don't know. Cape Thor has hurt me like no other track. but it's fine now, I guess...

so you wait for a fast skip, ideally on lap 2 and 3, cause you start the laps on full speed obviously. try flying straight over the lake and not to the left, as you want your car to fall down to the right and crash near or into the u-turn, where you wanna respawn. (or: hope for a crashless skip) after the lake skip it's just execution. hit the last boost early, as soon as you pass the rock. there are bumps on the road, you can avoid them by going diagonally or left-right-left (staying on the left side also worked, but I'm not sure). and be patient. and make sure you master the snow bridge, otherwise...well, you'll feel the pain.

theoretically a very low 30s is possible I'd say with perfect execution, judging from the best pace I've had so far. not sure about sub 30.