Trim tab location
I would think the outer panel would be the preferred location for the trim tabs, particularly if you're using them for lateral (side-to-side) trim control, which is mostly what I use mine for. The outboard location would provide a larger rolling moment for the same force/tab deflection, or conversely, would require less tab deflection (and drag) for a given rolling moment.
Deep V hulls also generate more lift and rise higher out of the water as speed increases. The 1973 Boating magazine test of the 23' Tsunami/Sceptre contains a shot of the hull with the chine completely out of the water at the transom at high speed (over 40 mph). (I can send a .pdf file of that article to anyone who wants it if you'll PM me with an e-mail address.) This means that trim tabs on the outer panel would tend to be mostly out of the water at high speed, reducing drag at a condition where you typically don't need the tabs anyway.
Of course if you're running fast enough that you need tabs to prevent chine walking, that's a whole other issue! Might need to big long tabs like race boats use for that situation. There is also probably a little more aeration in the water at the outer panel at higher speeds which would tend to reduce the lift generated, but the tabs on my boat seem to be very sensitive and effective for lateral trim control at normal 20-30 mph cruising speeds.
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