Haven't winter sowed any .. this will be my first attempt. When I do start them, I might soak one or 2 in some GA and see if that does anything .. I don't normally like to use GA on hard coat seeds because some of them go berserk and end up suiciding themselves because they can't get out of the seed coat as it hasn't had time to soften up .. with the GA ones, I'll actually make cuts around the whole seed.
Keep us informed about the Winter Sowing