is it pushing the boat in your pic? i doubt its actually running 5500 give or take 200 rpms.. my duck boat motor which was a 5 hp would only run 4 k and my chrystler runs 6 k... they are both stated for 5500..
2 strokes dont like to be bogged or reved to high.. 3000 sounds kinda low.. ever try shifting the wieght in the boat? for me the battery up front will make it go from 5 to 12 with just me.
most small boats with one person will ride with the bow up and create large ammounts of drag pushing the bow down and on plane will create less drag which allows the motor to run faster..