Hi Tich,
Just had my boat out the water for annual maintainance and getting ready for the winter
season and certainly not winterizing it. Obviously in the winter you have to pick your days as its all weather permitting, hell its the same in the summer. You can have some cracking days in the winter and we normally anchor up on hard ground, size of tides dont come into it in fact bigger the better. Its surprising how little water you need in the winter to catch fish, hence you dont need to be far off, just on the ruff/mixed ground.
I think a boat your size I would be sticking to fishing through the day and not in the dark, it gets pretty dark off there. Regardless of what size of boat you have you dont go anywhere without an anchor and one with a trip on your boat can handle/trip.
You have some excellent ground up your way,I,ve had some good days around St Marys and the can area, Anyway best of look and stay safe.
Davey