Accept the past. Live for the present. Look forward to the future. Robot Fusion
"As our island of knowledge grows, so does the shore of our ignorance." John Wheeler
"[A] scientist looking at nonscientific problems is just as dumb as the next guy." Richard Feynman
"[P]etabytes of  data is not the same thing as understanding emergent mechanisms and structures." Jim Crutchfield
The avatar isn't me, but it is one of my favorite hobbies, probably because I don't get to do it that often! I'll look out for those books, are they a better resource than the information on the internet?
It does seem that S and N is the hardest to differentiate between. I think there might be a lot of cross over; I know personally I use both in different circumstances. I also think that most ISTPs who would be interested in this would likely have more N than the s-typical type. Maybe that's just me though.