2 things: If you put trim tabs on then I doubt if any transom mount will work on plane. I have a I/O with trim tabs and my would not work anywhere on the transom, because of the Turbulence; I opted to install a thru hull 20dg offset. It works all the time, on plane or idling.
Just my 1 1/2 cents worth, (I'm not rich enough for 2 whole cents).
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Tis better to be quiet and thought a fool than open your mouth and prove it!!
1991 V-20 cuddy I/O 350 volvo duo prop, 1998 15ft Grumman 9.9 Johnson 
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