David,
I agree that holes 12-18 are fantastic. Coming off the 11th green I always say to first time guests: "OK, the course gets good here" and they look at me funny, because the first 11 are also really good golf holes.
What is fascinating to me is that this is an accidental routing and not what William Gordon designed. When Beth Steel owned the course, the locker room was in the guesthouse building. Current holes 11 and 9 were holes 1 and 10 in the original routing, When Beth Steel sold the course to Saucon Valley, they kept the guesthouse as a meeting center, so SVCC had to use an a different building (the old farm caretakers' home) as a locker room, and needed a new hole to start with, thus creating the routing you played, and what I think is one of the finest 7 hole closing stretches I have ever played..