My understanding is that Airbus carefully studied the impact that the six bladed prop on the C130J had on its operations.
The concept of having to come up with those sort of fixes on the A400 were overcome by the different rotation of the props on each wing.
There was a concern of the lack of interchange between the inboard and out board engines and props, but it was considered with the reliability of current build engines this was unlikely to be a major problem.
Does or will the A400 have a clearance to do three engine ferry trip to closest engine.
Regards
Col