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Has anyone with a 52DA with Cummins QSM11's reduced prop pitch to extend the exhaust and turbo life of their engines and if so what pitch? Both sets of props came from the factory and are EQY 28x35. Apparently they overload the engines throughout the moderate cruise power range.

I’ve owned a 2006 52DA for a couple of years now and it has always vibrated some at idle speed but smoothes out at about 1000 rpms. The props have been tuned. Is that normal or do I have something like a bent shaft? Or could the motor mounts be out of adjustment?