Correct prop pitch

[Elmo]

Anyone own a HS 23 WAC with 200hp? If so, I would be curious to know what size and pitch prob you use. Mine (yr 2000) came with a 15inch, 17 pitch prop on it but I notice I don't achieve the rpms noted for the engine in the manual. Range is 5 to 6k and I just make it to 5k wot. I understand if I drop the pitch it will increase roughly 200rpm per degree of pitch. Before I buy a 12,13 pitch prop, (need spare anyway) I would like to know what that will do to speed, fuel economy etc. Anyone have similar style boat/engine or thoughts on this? Thanks in advance.