LD Max - I too came across this problem whilst developing my ATPL(H) course.
In the end I included the correct information (in every subject, not just POF) and pointed out what was the dumbed down stuff for the exams. I know from my Microsoft experience how frustrating it can be to learn wrong stuff just for the exams, so I decided to take a stand!
Incidentally, on the helicopter side, at least, the FAA book is well known to be pretty bad since it was apparently written by low time instructors anyway. Go figure.
phil