Cav plate should be just above water when on plane, at speed, and when trimmed out at least 1/2 way to fully trimmed before the prop starts to lose its bite.
IF motor cav plate is under water when trimmed out running, then it's creating extra drag - it's pushing through the water, pulling on your transom, and slowing the boat .....
Like if you put your hand under water flat, and turn as fast as you can go, then angle your hand and try to keep it under water - you'd feel the drag under the water. Same for outboard.
Interesting that many marina's, dealers etc rig a bit too low......
I raised my 200 E etec and it's better, I may even go another hole - UP.
Don't sweat it if you change the position once or twice.
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