Chris,
You canÆt change the angle with the CV joint. The CV joint follows the layout of the vehicle. Friction and stress on the internal parts increase as angle increases. The usual solution is to use bigger CV joints. While this is somewhat proven bigger may not fit. Ideally lowering the differential to about the same height as the rear differential will reduce the angles giving better life, besides anything the front differential clears the rear is going to as well. Clearance of suspension components is an issue with going bigger as most vehicles are designed to fit around the original components. Since you are in Australia I am not sure the vehicle is the same as the US models. There are often models that are specific to the region of sale. I would suggest driving the vehicle in 4WD fairly hard for 15 minutes and get a temp reading on the CV joints with a IR thermometer. Then continue for another 15 and get a reading for an hour. (stay out of the water and mud as this will cool the CV joints). If the temps are over 200 degrees Fahrenheit near boiling for water I would be concerned about friction, which means you need to address angles. If the temps are low then your main concern will be stress only and I would look at bigger CV joints.
Kevin YutaniConstant Velocity of Ocala Inc.
1020 NE 16th St Ocala FL
34470352-351-9557 Office
352-804-5194 Cell

Just some correspondance....