Are you sure your glow plugs working when the car failed to start?

The M-B specs for compression are based upon a warm test (80C coolant temp) not cold. Still, your readings do seem low, however it is possible that just the fuel mist would be enough to bring them up to spec while cranking and since you tested them cold without the injectors you really don't know what compression is warm or with fuel.

If it were my car I would confirm the function of the GPs and try to restart it. If that fails, I would adjust the valves to make sure they were to spec and try again. If the car was running one day and just wouldn't start the next day I would suspect GPs are the cause, not a compression problem. I wouldn't spend money on having the injectors serviced until I got the car running again first. You can always buy rebuilts for about $40 each once you have sorted out the starting problem which is not likely to have been caused by the injectors.

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Marty D.

2013 C300 4Matic
1984 BMW 733i
2013 Lincoln MKz