Hollohead

I have re built an old 22 cabin I/o into a cc boat with a bracket and outboard. It has a DF 200A inline 4 Suzuki. The boat weighs 4400# with half fuel. With one person and this load I get 5400 rpm and @ 45mph w.o. This boat is stern heavy but large trim tabs keep it in check fairly well. I would like to increase low and mid range performance and gain some stern lift. The boat likes to cruise around 25 mph and in rough seas 18-20 is best as it is a mod V hull. Speed is not a concern. Goals: reduce plane speed, gain stern lift, Increase low and midrange handling and performance.
Current prop: Suzuki 3x16x21 5R
Thanks,
Gordon