Hi Les,
I am a bit confused, if you have not altered the swivel flange in any way then the only reason must be the sping mountings/bump stops that are in the wrong place?
If this is the case then surely the diff angle is wrong or did you fit the sping mountings/bump stops to get the diff angle correect and not notice the change in the pin angle?
The answer to the questions above will dictate what your correct course of action is to fix the problem.
As to which part to re-drill if needed, this depends upon how long you expect the axle to last? If it will only last one set of swivels then drill the swivels, otherwise re-drill the axle so that you can fit new swivels in the future.
Hope that you resolve this easily and successfully.
Having investigated the axle ends a bit, I was told that LR use some really complicated sounding bit of kit to friction weld the ends onto the axle tube.
Its a shame that they did not go the way that other (US) manufactures did which is to slide the axle end over the tube then weld.
This way it is easy to change an end to alter the angle or narraow the axle.
Marc.