my experiance is different than you both.
if you are looking for all around proformance hole shot,handleing , speed , ecomony,
least slip. then the factory is correct almost all the time.
if your only concern is top end speed and nothing else then your hole set up needs adjusting from engine hight, on to prop, to weight dist.
it's all in what you want to accomplish.
the factory recomends the prop and hight that will give all around good proformance.
it's how they designed the boat to function, so.... it's in there best intrest to have the most customers happy not just the speed guys.
sorry but the factory is doing what is best for the most pepole.
includeing their laywers who have to defend agianst the fool who props his boat wrong and either blows up his motor or kills someone by driving to fast for that hull.
by all means put on the fastest prop you can find but saying the factory is wrong is just plain foolish.