Hi Leaky,
I will not be able to do anything more to the boats until after Christmas, but with the proven motor and ESC combo it currently has fitted, it will run OK - but I do have the use of a bluetooth programming device that I will still try as the smaller ESC is a lot neater fit in the boat and it should be more than adequate for the size of motor that I will most likely be using.
Once the boat is running I will be able to see how the M4 prop shaft holds up. I would usually choose to fit an M5 prop shaft, but this boat was started some time ago and if I was doing it again I would definitely fit the bigger dia. shaft.
After Christmas I will complete the painting and hope to get the boat on the water in the New Year.
Merry Christmas!
Bob.