Some schools teach "shuffle-steer" which is not generally the PCA method. I have always been told to keep hands at 9-3 o'clock and only remove a hand from the wheel when you are going through a hairpin or other tight radius. When you have to take your hand off the wheel when you run out of arm, like when you make a right turn and your hand is down at the 7 o'clock position, you flip your palm 180 degrees and grip the wheel at the same spot.
I personally drive in the old driver's ed style at 10-2 o'clock, but that's only because I find that it takes all of the muscle in my tricep to pull the wheel down to hold the line in corners. This is with a Momo Typ 07 (a modern Prototipo, and the current factory race wheel) which trades off leverage for rate of rotation and overall mass.
At the end of the day it's whatever makes you fast. The only real knock on shuffle-steer is that you don't have a constant reference of where the on-center position is, so that when you begin to unwind the wheel after the apex, you don't have a natural unwinding reference assuming the turn is constant-radius. But a lot of better drivers than me shuffle-steer, so, if you are more comfortable and are turning better lap times, tell 'em to go pound sand.
