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Trim tabs are handy for trim adjustments, and are a cheap way to lengthen a hull in plane. However, width is much better than length for planing, for the same reason that gliders are wider than fighters.
Displacement hulls have the unique problem of producing waves, which gives rise to a given hull speed often quoted as 1.37 X the square root of the waterline length in feet, to get the speed in knots beyond which great increases in power barely return any more speed, until the boat planes over it's bow wave, if possible.
Hydrofoils are quite feasible as add-ons, and increase both efficiency and available speed in a given sea condition. A main wing can be almost flat, carrying over 90% of the load, with a small canard having it's angle of attack controlled by a little spoon follower on the surface, provide a simple, stable and efficient configuration.
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