Help setup Piranha Espada 4,80 m with johnson 175 v6

[Flabenk69]

[ATTACH]name gero and I'm Italian, I'm very sorry for the wrong English!So I present to you my boat a Piranha Espada of 1988 of 4, 80m with a johnson 175hp v6 60 degrees with the 150 hp carburettor and propeller pitch 19 original aluminum omc!
the boat has an incredible set but the maximum speed does not satisfy me at all!
but since I am in this forum I feel with you, this is a small problem!!
the boat gets to 46 mph at 5600 rpm with 19 omc aluminum propeller (in the photo)
and a steel propeller pitch 18 arrives at 50 mph at 5800 rpm!


is not it a bit too slow??


I will! and I want to make sure to get her to at least 75 mph


do you think making the right changes can I get the speed you want from me with this engine????


if yes, what should I change??


if not I have a mercury 2.5 efi


PLEASE HELP ME I AM IN YOUR HANDS