I have a 1977, Atomic-4 powered P323. In reverse, the prop walk makes it back to port.
(I understand that the diesel powered P323s rotate the opposite way, and back to starbord)
What I've found is that getting the boat moving is crucial. I generally start backing with
a high throttle setting while holding a good force on the reverse position on the "shifter"
lever to minimize any slip and get reverse going as quickly as possible. As soon as the
boat stops moving forward, I immediatly reverse the ruder to oppose the prop walk.
The boat ignores the rudder and starts backing to port until it gets a little speed and the
rudder starts to bite. At that point, I back down the throttle, which reduces the prop walk
and lets the rudder take over, allowing me to "back it like a car" from that point on.
What this means in practical terms is that whenever I need to back into somewhere, I need
to allow a little room to get a "running start". It's kind of scary, as the boat starts to go the
wrong way, looking like its going to crash into the pilings. The natural impulse is to immediately
back off the throttle, but that's exactly the wrong thing to do! Wait until the rudder starts to
bite, THEN back off the throttle. It's nerve-wracking, but it works.
My slip is tight, and there are pilings across from it. This technique lets me back into it.
For getting out, I have two lines strung down the sides of my slip. I use those to get the
boat moving forward by hand. When the outermost piling on the starboard side is abeam
of the starboard winch, I take a line from the piling, pass it in front of the winch, and
hold it tight while putting the engine in forward at idle. The boat cinches up tight to the
piling (I have stainless steel rub strakes on my toerails), and it pivots around the piling
neat as can be. Once the turn is complete, I hang the line on the piling and we're on
our way.