That seems logical. Your general fuel pressure is now higher. Or more constant. Or a combination of both. Hydrostatically the fluxiating changes where almost instantainiously transfered through the system into the injection pump base with bad lift pump valves and good fuel filters.

Here are some pictorials from another thread for all of those who feel confused about the location and structure of such valve...

w123 240D rough idle

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[GONE] - 1995 Mercedes E300 Diesel - 130k miles - Smoke Silver (702) over Mushroom leather (265) - Bladder blasting, coast-to-coast work machine.