When designing or selecting an appropriate CV joint there are 3 factors that are directly linked together. Horsepower / Torque, Angle and Heat Dissipation.
Horsepower / torque is the amount of load or torque being applied.
Example, if you want to increase the horsepower / torque, you will need to either increase heat dissipation or reduce joint angle.
So in regards to the Raptor, if you want to install IWE eliminators (Constant rotation and increased angles), you will need to either decrease angle, move to a colder climate or change out the CV's completely to a different / larger kit.
If you want to increase the horsepower / torque (loading) you need to decrease the joint angle or increase heat dissipation.