Therefore he would always have divers on board and all the weight that goes with that. It may be that the boat needs a bit more weight.
Dont really agree, you can have a light boat that is over powered without any wobbeling, most of the wobbeling depends how boat is balanced compare to the outfitting and engines.
Boat looks little heavy in back but not so heavy that it should start to wobbel at 40 knots.
Another idea is the props, do you know how many revs you have at full throttle, maybe you need some other props to get better grip, it will effect the topspeed a little but a more pleasant ride without compensating the wobbeling all the time.