Regarding the beam angles and profiles.
Finding out the center of a bare XR-E (or other) emitter is not an easy job as the beam center is not always in the real center. The beam profile gets somewhat inconsistent in the central regions, you can get different intensity curves from the estimated "0" angle, depending on the rotating direction or the orientation you attached the led to the heatsink.
I mean something like this (two thin lines are painting errors on my wall)
This can be a reason of the different beam profiles of the old and new XR-E P4 tests.
The real zero angle position can easily be missed with 1-2 degrees. This can affect lumen calculation also. If the same intensity values are belonging to greater angles, this results in more cumulative lumens.
For a quick test, you can try getting the profile towards the other rotating direction and average them.