If a 20 footer needs trimtabs, there is something strange going on.
Gradys are a heavy boat but still should not need trim tabs.
Tabs can bring your bow up or down.
My hydfrofoil on my 21 proline with a 175 works great and can change the pitch while underway. But I'm pushing with an outboard.
You say your'e doing 40 mph but not at plane?
You may have a prop issue. Its a easy and cheaper fix.
Maybe look into that first.
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