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I wouldnt go as far as saying you have a bad rod as of yet. Stick with the simple checks first. First check I would do is take the prop off and hook up your water hose to the engine and see if you still have the same problem. If you dont I would say the prop may be binding at a lower speed,may have bent when you sucked up the line. A bent prop dont always shake at all RPM ranges.

Think you will need a slip 38 foot boat is a little much to be hauling around

No intake strainers?? I would install some ASAP. As for the problem Kevins answer is a good start. A fast a pretty good check of risers and elbows is to start the engines and let them get warm. You should be able to lay your hand on the risers and elbows with out them burning you. If you touch them and you move your hand back like you just touched a oven burner then I say your riser or elbows or both are pluging up. Check your water coming from your exhaust too. Does it look normal or has the flow slowed down? Any dips in your wet exhaust hoses can casue an engine to start running hot as well and if they are dipping then its time to repalce them as well. Scale and rust lodge in the mufflers will casue the same problem.May have to remove them and shake them and see if you hear anything rattleing around inside the mufflers. Here one I came across couple years ago, winter lay up a familly of squirrls had made a home inside the exhaust tubing about a foot or so from the outlet. Make sure your exhuast is clear.