One more detail I have noticed: In 29th Flotilla careers started in March 1942 it is not unusual to get assigned to grid CJ26, which is in the north-east coast of Italy in the adriatic

Unless there is some historic action there I can't remember now, I would say that the assignement is an error?
I have customized my own Flotillas cfg replacing CJ26 with something more appropiate, and of course SH3 commander or SH3 patrol can solve the problem, but again it could be worth doing the 30 seconds job of changing it for the next NYGM patch/released fix