There was this same exact issue on some of the 3 cylinder ones just a couple of years after going to the VRO.
One correction (don't know if it was successful) was to replace the pee hole stuff from the block to exit. This included a kit of an increased size of a few fittings from the block to the outside, basically the screw in 90 to barb fitting, the hose and the outlet.
Don't ask me why this would work, only thing I can figure is an increase of water flow from the impeller.
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'75 Cuddy with '00 Johnson Ocean Pro 150 horse
Benny
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