I just bought a 1993 pro 180 this year and it actually has a mid 80’s 200hp merc with a 13 3/4” x24 pitch prop. I rebuilt the carbs and seems to be running great. Get it on the water, go to take off and RPMs and nose goes up but stays up will not plane. And yes my trim is all the way down. Need some advice what to try next. Thanks in advance.