Just found this little gem from 2000/2001 called Deluxe Ski Jump. Very late, but it’s definitely a DOS game.
Pretty nice 3D graphics, quite well polished and pretty good controls, even though I never got very good at it.
(I played a full tournament, and finished second last! I think I landed in the scoring area maybe one time in 5)
I’m not sure where the developer, mediamond, is from. Maybe Germany given the doc file that came with the version I found was in German?
[edit: nope, they’re from Finland]
I think you could actually lose a lot of time with this one. It seems to have a pretty high skill roof, and strangely addictive gameplay.