On Mar 30, 10:10 am, Tim wrote:

... I know that money spent in the right direction will save in
fuel and ride in the longer run. But over kill is still overkill. This
is a 23 ft. V-hull Marquis with a 350 GM engine and not some 3000 hp.
40 ft. Fountain off shore racer. So, anyone have any suggestions?

Tim, I missed this thread before and perhaps you have already found your
answer.
If you decide to got with trim tabs, it's important to get the right size.
In general, the width (or span) of each tab should be equal to 1-inch for
every foot of boat length.
So, a 23 foot boat should have tabs that are at least 23 inches wide.

Bennett has lots of experience and has a chart of recommended sizes:

http://www.bennetttrimtabs.com/trimtabkits.php

Eisboch