I use the aft spring line technique also and it works great. My dock is on the starboard side of the boat; the boat walks to port when in reverse; I need to swing the stern to starboard when backing out. The springline on the aft starboard corner enables me to do that. I play with the tension on the line while backing out to keep the boat parallel with the dock, once I am out far enough, I hold the line fast, and the stern swings around.
If you don't want to use the spring line technique, you could pull the old spin-o-rama technique; it works great with a fin keel: once out of the slip, turn hard to starboard and give forward thrust, just enough to get the bow rotating starboard, then switch to reverse without changing the rudder angle; this checks forward motion and walks the stern to port. Before the boat starts moving backwards too much, shift into forward again; this stops backward motion and swings the bow starboard. Just keep repeating the process until you are pointed in the correct direction. Remember, keep the wheel turned to starboard at all times. I can spin my 38 footer on its keel using this technique.
Note, if your prop walk is to starboard instead, then reverse all of the directions above (keep the wheel turned to port at all times).
Yeah, people may think your crazy, but it works.
Catalina 38, Hull #112
Grosse Ile, Michigan