I have a bit different hypothesis. Don't get me wrong, low compression is very, very bad; but it might not be the cause of the misfire. What I'd like to know is:

What was the condition of the plugs you pulled from the low compression cylinders? Were they black and oil fouled or were they nice even grey?

Get one of those test probes that can detect coil pack firing and voltage, and see if at idle, they are all firing properly.

Did you try swapping the coil packs on the left bank with the coil packs on the right bank to see if the problem moved?

Assuming that the plugs look good, and swapping the coil packs does not move the problem to the other bank, I would start to think about a bad ground for the offending bank.

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2008 BMW X5 4.8i Sport
2000 BMW 528i 5sp