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Have you checked the pressure readings with a scan tool that can read the high pressure actual vs desired or do you have a manual gauge you can install and see what the pressure is? That will give an indication of a seal issue in the valve covers.
On the IDM, yes they get weak and cause issues, but they tends to drop out on one of the injector driver chips giving a IDM failure code.
On the glow plug relay, if the connection is coming off of it whether the glow plugs throw a code or not, it powers the IDM so if you have a bad connection off the power pin from the relay, you will get low voltage out of the IDM. I would check to make sure you are getting the proper voltage from the glow plug relay to rule that out.
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