Thanks again for all of your input. I really appreciate everybody here trying to help me out.
The photo below shows that a hook includes an upturn in the hull, like an upside down cup, just as you describe. This will act like a trim tab, too.
You have a futura hull on your boat, so when you plane, your boat rides considerably if not mostly on the speed tubes, much higher up and out of the water than my boat which has a conventional SIB hull. I could imagine that that might mitigate the effect of a hook in the center of your hull.
Nobody disagrees that a motor that is trimmed in will bring the bow down. I just can't keep describing over and over how trimming the motor out does not solve the problem that I have with the bow coming down as I accelerate beyond planing speed.
When my A/C plate was 3 inches below the bottom of the transom, I trimmed the motor all the way out. The bow down attitude got slightly better, but was still a huge problem. In the 4th or 5th trim holes up and away from the transom, the A/C plate started to become visible at the water line and cavitation emerged. That's not a big suprise since the prop was brought close to the surface of the water. Now that my A/C plate is about 1/2 inch below the transom, the bow down attitude is better, but still problematic. Furthermore, now I have cavitation all the time that got worse as I trimmed out (to address the bow down attitude) and got better with an additional 200-240 lbs in the boat. Since the bow down attitude is present as I accelerate from planing speed whether the motor is low or at proper height, and whether the engine is trimmed in or out, it is IMPOSSIBLE for trim to be THE cause of my bow-down problem.
Either the boat was designed and is supposed to run with the bow down as I experience, or there is a problem with the hull. I find the former hard to believe.