I have a 1992 concept 21.5 that is now concidered the 23. I'm running a 98 johnson 225 on a hydraulic jackplate. Im looking for some advice on the best prop to run. I have a omc raker 20p but its not enough cupping or pitch. When I raise the motor it slips a lot. The raker 22 has more cupping which should help. I know most concepts are running mercs but any tips would be greatly appreciated.