Tohatsu50hp / weldbilt 1648v setup/props

[4strokepower]

Ok I've got a new 50hp 4stroke Tohatsu tiller and weldbilt1648v with atlas micro jacker hooked the bottom of the boat to make the boat hold the nose up and running Yamaha painted stainless 16p prop boat by myself with tank and battery in the back of boat will run 43-45mph at rev limiter 6150rpm however with 2nd person boat will not hold the nose up and run like it should it lays down and rpms drop to 5600 at around 38-39mph need advice on what to do with setup and what to do prop wise to go faster maybe someone with a similar setup can chime in thanks