i will keep this simple. 9.8 4 stroke tohatsu,2009,1444 g3 jon. 19+ mph with 1 person@ 5400 rpm. 2 people approx 10 mph,@4500 rpm. these are the max speeds i get with the best conditions, measured by gps. will a prop change increase my top end with 2 people and if so what prop? it has the stock...