Try Ken at
www.propgods.com out of Fl. He has a try before you buy program that is easier than easter egg hunting for props. He propped my 24 Triton w/ a 250 verado the first try. Lots of bad advice on props out in the market so really the only way is to try a few without getting too skint up!
Porpoising is not an easy problem. My brother fixed his pathfinder with an adjustable jack plate and a 4 blade prop.
BTW Verado WOT rpm range is 5800-6400 rpm. Need to prop to hit that rpm at WOT no matter whether you run WOT or not. Verados will push gasoline past the rings into the oil if you lug them down with too high a pitch prop.
See www. veradoclub.com for all you ever wanted to know about Verados and props.