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More wetted surface means more friction.
Tunnel takes up planing surface, provides less lift on plane.
Reshaping water takes energy and usually causes aeration
so a cupped 3 or 4 blade prop is needed to get efficient bite.
Power jack plate needed to fit engine height to conditions.
Chop lifts the boat out of the water, pushes air under the hull and tunnel loses prime.

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What are the down falls to tunnel hull boats in the 15' to 19' size range?
Slower by 10-20% than non tunnel, reverse is a pain, drafts more as well, ride suffers....
However, if you wanna run skinny than a tunnel is needed as you'll run shallower than you'll float. Places like Bahamas and TX all are tunnel fans...
Hope this helps?
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