As a comparison I would have no qualms going to sea in a F4 in Madness. I would probably be doing 18knots coming to Poole and 13/14 knots going back your way
Hi Neil
Coming this way you will be with the conditions and should be ok, fishing should be ok also
12-15mph in your boat should be fine but going home you will be against the elements.
It shouldn't be stupidly rough but will be dependant on whether the tide will be against the wind going home.