I tried to relog with BimmerLink, it seems to roll up the values per cylinder, ie 1and 5. But I did see the same voltages as in Deep.
Did you try just pulling the injector and coil plugs on cyl 4 and see if it runs smoother and or other pistons? Did you end up getting a better compressions tester?
Seen this,
https://f15.bimmerpost.com/forums/sh....php?t=2074941
There was a re-fresh for the coils (sometime in 2015/2016) and not all coil plugs are the same. The connecter will not sit all the way in.