When I first slipped my Silver Line with a V-8 (305) motor, in the water, alone in the boat, , she'd get on plane I thought pretty good, (first motorboat so I don't know HOW FAST it should get on plane)
with a 19" prop.
Later,
I had my wife, another couple, my 9.9 kicker engine, fuel, etc. on board.
She would not get above 3,000 RPM, or get on plane!!!???
My buddy told me I had "too much prop".
I went to a prop shop, told my sad tale and the guy sold me a 17" 3 blade prop.
Made a world of difference!!
The idea being that the bigger prop was making the engine "work too hard", (like a higher gear in a truck).
I looked at props myself before I went, figured I'd get the "OEM" size prop, (no! they are set up like that),
I was told some place will even let you try a prop before purchase!!
There is a pile of good info on line about props, (careful, some is too technical).
Joe
As always take any advice I give with a beer er 2!