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Hello, I have a 22 guardian with a 225 honda outboard.
I am getting excessive spray from the outboard.
The top plate lines up with the bottom of the transom.
My motor is mounted on the lowest mount hole.
Anyone have the same setup? Should I lift the motor one hole up?
Thanks

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The anti-ventilation plate should approximately line up with the bottom of the boat. If the "top plate" lines up it may be too low.

Engine height is trial and error. When I set up for performance, I try each setting, collect data, and then put it where it belongs.

I have never owned a boat where all the way down was optimum.

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Have you had a 3rd party look over the transom at speed to verify the spray is coming from the lower unit and not a transducer? If so, then read below.

Owners and some dealers, through significant testing have established the starting place for Boston Whaler hulls is 2 holes up. The anti-cavitation plate should be 1-1/2" to 2" above the bottom of the keel.

If you have a stainless steel prop, I would start with 2 holes up (top bolt in the 3rd hold counting down from the top).

Note you will gain ~150 rpm per hole you raise the motoe. If you currently reach WOT rpm's at full throttle, you will go over after raising the engine.

Test moderate turns at 3/4 speed and large seas to see if the prop ventilates. If so drop down 1 hole.

Test the boat several times in various conditions and loads a few times before considering any prop changes to reduce WOT rpm's if over the limit.

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Phil is correct. I however start all the way up and go down if necessary. It is easier going down than up but either way works. Most of my Whalers are mounted all the way up, especially 4 strokes.