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Well, yeah.  You do have to have the right prop.  I have had mechanics put feathering props together to the wrong setting and the engine couldn't get much above idle under load.  Weird sensation.   Oddly enough, my mechanic's method and the Yanmar recommendation come within 50 rpm of each...

Haven't seen this in the above, but my mechanic says to run the engine up to full throttle under load and then calculate 80% of those max RPMs and that's your target running speed.  Starting cold, we always give it 3/4 throttle and then promptly back off to a fast idle until smooth.  Then walk...