Don't drive it hard when trying figure this out. The compression looks fine though so that's good but one thing that sometimes doesn't show up with a compression test and can be a bit random is worn valve guides, worn cam as well but that should be really consistent.
If you are setting misfire codes when driving normally and not when you are driving normally with the MAF disconnected then that helps. If you need to drive it hard to get the misfire (the one code was set at 6000rpm!) that's a clue too and probably not related to a vacuum leak but if you try too many things at once as far as driving goes it's going to be confusing.
The only way to be sure about the MAF is to replace it with a known good one.

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