Cat Flap

I wonder whether in that mode the data reported is somehow the difference in acceleration between that and the last event?

Ah, perhaps! How are individual events defined? The literal last movement, or a pause from a significant movement?

I tried your code, and simply added the conditional for the z-axis and nothing more and still got similar results (so I also tried higher G, but similar results too):

OUT: -12203
CLOSED: 1539
IN: 13687
CLOSED: 3942

Interestingly just opening the flap fractionally and letting it close produced results like:

OUT: -32750
CLOSED: 361
IN: 32536
CLOSED: -2171

With the existing power saving configuration I tried my approach of adding a 5 second lock once an IN/OUT action has triggered. I only ever pushed the flap out and got this:

OUT: -6809
CLOSED: -1454
OUT: -7337
CLOSED: -1391
OUT: -9631
CLOSED: -97
OUT: -6141
CLOSED: -433
OUT: -17430 -> Hugely inflated reading.
CLOSED: -324
IN: 7935 -> WHAT!? It has registered an OUT as IN, following the last hugely inflated reading.
CLOSED: 548
OUT: -7828
CLOSED: -1584

SOME MORE

OUT: -7297
CLOSED: -441
IN: 7833 -> In registered again, normal out reading previously.
CLOSED: -1446