The needle on the compression tester should jump and hold at each compression stroke so do that for 4 strokes, not more, not less. You need someone on the key or a remote starter button. Doing these kind of tests for the first time when you are having a problem like this is a problem in itself. I checked my spark gap tester from when I last checked some M54 coils to compare them and it was pretty close to 30,000 volts.
You can pretty much hear puffing back from the intake valves on the video so you better look into that again.

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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)