I have had the same problem with mine but a little different. On mine I have to get the engine above 5000 rpms then I can cut back to cruising. If I don't get it above 5000 and run it like that for say 1/4 mile or less, then the water temp alarm will go off. I boat my motor used and the guy who had it before me never had this problem. I have had the problem ever since I bought it. The highest water press I have seen is 13. I have not seen any better and I have raised the motor and come back down. I have taken it to the dealer 2 and they hook the computer up and call the EVin techs and they say to raide the motor. Going to take it back in next week and I think a tech is coming down to look at it.

Model:E225DHLSDF
Serial:05127326