Ran 3407 very briefly this weekend. Only dropped RPM about 100, right around 3800 @ 11.2 with 250lbs lead in the nose and two people. I expected better reduction since I am only at 450 feet. I guess this is just where the 440 wants to run, even with 5 or 6 people in the boat my rpm's do not vary much at all....plenty of power, never struggles.
I might be up for one more try at a different prop...….2849, 3093?