This is a Prostar not a Malibu but both are left hand props. The factory grind (shown here before filing) created more torque to the right than I wanted.
I hand filed the starboard side (arrows point to) in increments till I achieved the amount of rudder torque desired.
Filed a bit, drove it, filed some more, drove it. Until I ended up with the amount of pull to the right desired.
You want to maintain some pull to the right as it takes any play/slack out of the steering. Driving a boat through the course with neutral steering will make it more difficult to maintain a straight path.
You want to have enough pull to the right so that the wheel will move right quickly enough when you relieve pressure from it to maintain your straight line but not so much that it’s a beast to hold on to.
Good luck.