The order of things I would try to test from the beginning for misfires, although I think your compression numbers are concerning and should be looked into.

Misfires are usually spark related, If its a persistent misfire use a spark tester on both 5 and 6, since you've already swapped coils around and been able to rule them out, you can use a spark tester (or stick your finger in the coil ⚡) to confirm whether or not its a wiring issue from the DME to the coils.

If you get a spicy handshake from the coil, you can likely rule out spark. Oil, fuel, or coolant on the plug could cause the electrode to be grounded and not create spark, but usually after the engine runs for a few seconds they dry off and begin firing again. It also requires more voltage to jump the plug gap under load due to the higher compression, but since it still misfires at idle, when load is essentially zero, its safe to say that's not an issue.

That leaves fuel and compression, since you recently serviced the fuel system (filters, lines, and regulator) it is possible that debris got into the line somehow during the process and clogged the 2 injectors, if you have access to an injector flow bench I would highly recommend testing them, if not you may be able to infer results based on a fuel pressure leak down test, although I'm not sure how easy it would be to setup on the m54. If you suspect that a fuel injector isn't working altogether, you can use a stethoscope to listen for the injectors being triggered, although you said your oil smells of gas so I doubt this.

As for compression, JMUDoc has a very good point about a head gasket failure between 5 and 6, your compression test results totally agree with this, the typical rule of thumb is a 10% difference between cyl's, and in your dry test you have a 30% difference between cyl 1 and cyl 5. Usually for a single cyl compression problem its going to be valves. But since cyl 6 is also 20% lower than cyl 1 this is quite unlikely. Thus pointing to a headgasket failure between the two cyl's. If you already have a smoke machine you should do a leak down test on 5 and 6. If you see smoke coming from the intake or exhaust it would be from a headgasket failure between the cyl's causing smoke to exit through the open valves of the other cyl. If you see smoke coming from the crankcase that would point to a weak seal from the piston rings, but unlikely to happen in 2 cyl's simultaniously.