If everything is as it should be with the boat/motor setup the 17 should turn up a little too high and the 21 too low.
Try the 19 and see how it performs.
Most guys with a 150 horse do real good with a 17 pitch, some with a 15 and a couple with a 19.
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'75 Cuddy with '00 Johnson Ocean Pro 150 horse
Benny
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