I have a 15ft 80's performance bass boat it weighs rougly 750lbs I switched a bad 40 hp evinrude for a good 55 hp johnson( i know its a johnson) but afterwards I cant get it to plane out it seems to be pushing I have no clue what pitch prop I have on and what pitch I need to get it to plane out it just keeps pushing cant get it into the higher rpm band either. Need help