Looking for some help here for a17 ft. Sea Sprite 1978 with a Volvo AQ120B with Volvo 270 outdrve, Prop is a Solas aluminum 3 blade 14.8 X 17 pitch, boat seems to be digging in and slow to get on a plane. Now prop has a pretty good chip out of it and looking to get another prop but unsure if we should match with what came with the boat. Anyone have a suggestion?