As a flight control engineer, what do you think about the phugoid damping terms active below 100' AGL radar altimeter? That left Sully with not enough pitch angle, a higher rate of descent, and a higher speed.
A ditching study on the A320 said 11 or 12 theta is fine, a 3-point landing on the water. Of course, too much speed can rip the nacelles off. Too much rate of descent can crack the fuselage.