Then it must be MY individual M2P.... the numbers in my attachment are categorical.... Immediately before the update, and immediately after, from exactly the same take-off spot, and all other settings exactly the same before and after.
As I said in my post... it is MUCH better now, but not quite on the spot (for my machine), and I congratulate DJI for their effort...
I posted a separate thread on the EXIF changes:
Firmware v01.00.0510 EXIF altitude changes