My opinion for what it's worth is use your own powers of deduction from what I tell you.
If you had 1 350 hp outboard engine on the same boat, what dia prop would you use? Also that prop would be a thru-hub style prop that doesn't have full blades like an Arenson prop would so it's small in area. How many rpm's of prop speed would that outboard have?
You answer those and you tell me why you need a BIG 17" dia prop on your boat?