Trim Tabs all the way up coming in the jetty, out in the open ocean raise them upl until you hear/feel the props slip then lower the tabs until the slipping stops. When I was powered with an AD41, I pretty much ran with the tabs all the way down. Once you get above 16-17 knots you and raise the tabs to trim the boat better. Now with the D4-260 at speeds above 20 knots my tabs are barely down at all.