Everything I ever saw about proper motor height boils it down to cav plate height above the water w/boat on plane.
The cav plate on plane should be 1/2" to 1" above the water.
The only reason to set it any lower would be if your particular hull/motor/prop combination has a tendency to blow out on turns....and that assumes you're trimming the motor full down on those turns...
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'74 V-20/ BF 150
'95 V-21/ BF 150
'84 V-20/ 200 2.4 Merc
'87 V-20/'18 F150 Yamaha
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