I would definitely try the 175 main jet and see how it runs at WOT, you may find yourself back with the 170 but better to be safe than sorry.
42 pilot 1 turn out sounds good, ideal is 1 to 2 turns out. Yes, a very lean pilot would give you a high/hanging idle, so sounds like your just in the right spot.
I'm sure you must be pleased, it's very rewarding when you get the carb set nicely and can stop thinking about it and concentrate on your riding.
