time for me to man-up and ask....
I have heard lots of you speak of a hook in the hull,
what (so a nube would understand) is this ? 
Hook; a concave depression in the bottom of the hull typically in the rear flat areas between the strakes. They act similarly to trim tabs in the down position.
Rocker; a convex bump in the same area that a hook would be.
Hooks were used by many manufacturers to eliminate ill handling hulls due to porpoise issues. Also made driving the boat more idiot proof.
Rocker was used to help carry more bow lift. These can be sketchy to drive.
You are more than likely to desire a flat keel line vs. either a hook or rocker. More user friendly and easier to tune.
GT
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