My 125 2 cycle Merc on my 20 foot Monark with 2 people is propped this way.Good to know. I currently have a 19 pitch, 14.5" diameter prop. On my boat last year, I had a 17 by 13.25. Not sure I would want to mess with the pitch because I fish quite a bit out east, where the lakes a bigger and speed matters more. I was thinking about a stainless steel prop though. My second boat could get to 45 mph on a good day, by myself, at lake MacConaughy, and it only had a 125 HP engine. But it had a stainless steel prop, and it never had a tank full of gas. ;D Who the hell needs 36 gallons on our lakes? That boat was lighter and not as wide, which helped too.
15 pitch for mountain lakes (11 mile, Spinney)
17 for Chatfield
19 for Powell
As mentioned the key is wide open throttle RPMs
Pick a prop pitch according to the way use it most.
2 people, 4 people etc.
A four stroke has more torque than a 2 stroke IMO.
I would try a 17 pitch for higher elevations.
Your 19 for lower elevations.