Having an issue with my 04 Tr-21x w a 225 opti as well, not sure what the original prop was, but we ran about 68 top speed, that prop has since been replaced and we now have a 26 pitch turbo, but we somehow run higher RPM 5900(which is too much) and only 55-60 top speed. I’m really not sure what is going on with this and it has me concerned, but the motor runs great, just not near the speed we had before. Any help would be appreciated