well I did have somebody go under the boat and the prop is in good condition. Now the bearing that camarederie mentioned, I assume its the bearing that sits between the prop and hull? its infact not sitting up against the hull. its just sitting halfway to the prop. And I do have steady fast drop from the prop axle. The water flow increase as the rpm increase.
DynaMeme might be right about the carbon buildup its definitely worth taking a look, also replace some of the hoses sounds like a good start aswell.
Thanks for your reply's.