I see where this is going - the problem is......ME!!, I´m to lazy to change fin.... :-) (really I am) Next time the wind is 14-15kts I´ll try another fin, and see what that feels like. I have 46, 48 and 52cm slalom fins, so it´s only a matter of walking to the car and doing something about it.
Yes, the water is shallow, so I need to walk out further. This however, is okay as water temp is 6 degrees and walking gets my temperature up :-)
Thanks to you both - this will keep me occupied.