I played Cliff yesterday and I think 18 near the fence will definitely produce some score differential, even for the pros. It's about the same distance from the tee as 18 short but about 30 feet higher, so it's defintely improvement if you think 18 short is a tweener. Add in the extreme slope and any uphill putt over 20' will be challenging.
On another note, if someone gets hot, I think 45 or 44 may be possible. If you can throw 400', every hole is a potential deuce except 1 and 18, with 6,8,12 and 17 being tough deuces. It'll be interesting to see if anyone gets close to the course record.