I have quite a few rally tracks that're fairly tight and technical. I don't think I have any with a big jump in it but I can have a mess around tomorrow and see if I can create one...
EDIT: Just created some Liège gravel tracks that are as narrow and tight as the course maker will let them go...no big jumps though. I've created banked and non-cambered versions too, for more of a challenge.
I've also cooked up some Alaskan tracks along the same lines, one or two with a jump and a few surprises in there too.
Anyway, they're all good for staying sideways, going fast and having fun.
If you want these, send me a PM and mention the tracks.