I have a friend with a large, deep Vee hull.
With twin Mercury 1,100s the boat is reaching 122 mph at 5,400 rpm. While continuing to increase throttle the boat is going into Guardian mode at 6,400 rpm at approximately 145 mph.
What are the possibilities that could be creating the situation for the boat to prematurely enter Guardian mode?
The boat is running a set of 17 1/2 x 38" 5 blade Mercury labbed propellers.