Well that's a no-brainer. The RUF hasn't got the extra downforce necessary to keep it from sliding around, and weighs several
hundred pounds heavier than a Toyota GT-1 or Nissan R390, even if you give the RUF a Stage 3 weight redux. It's also got a Rear engine.... The engine, weight, and lack of downforce is all a recipe for imprecise handling (when compared to any of the GT-1 or LM cars you're up against.) I mean, i believe it's
possible to win against these other beasts in a RUF--i even tried it once at Rome 2 hrs and came in 2nd or 3rd. It's possible, but it's not easy.
I've done the SSR5 enduro in several cars...i remember one of the first times i tried it, i was in a Corvette Grand Sport with the red,white & blue race-kit

but my win didn't come easy because the Grand Sport weighs so much more than the best AI cars in this event. The Toyota GT-1 is a killer down that straight...i couldn't keep up with it, so I basically had to out-corner the GT-1....in a
corvette! Tha'ts asking alot!
Anyways, i congratulate you for not using an Escuseo. To try this race in a RUF shows you got some balls.