Last week I brought Maja to the swimming lanes with the boat club. I had put some shaft grease in the rudder shaft. This seem to have fixed the water ingress problem.
Maja is however quite overpowered so for manoeuvring it will probably need to go slow. That is not really a surprise
I don't think I'll be using this boat a lot. It will mostly be used for manoeuvring contests and perhaps for practise before those. What is really nice is how small it is.