Well, their instruction is to go with the OEM recommendation
Same thing with the Detroit Truetracs I had in my Range Rover. Adjustment as per manual.
There's something weird in the manual also.... the pinion (only) rotation resistance is given as newtons (force) using a spring scale and pulling from the drive shaft bolt hole.. the additional resistance (increase) from the crown wheel tooth contact + side bearing preload is given as a torque. Must be a error in the latter figure.
Tapani