250 verado

Hi All, I'm a long time boater but new to pontoon boats.  Had my boat for about a month now and love it.  It's a 2275 RCW with ESP, rough water package and running a 250 Merc Verado.  Only disappointment so far is the top end performance.  Dealer installed prop is a 19P Merc Vengeance (3 blade...