AYO, do you use any leave-in? Might help your winter dryness.
I live by my leave-in, and I've completely switched over to sulfate-free shampoos and conditioner. As a result, my curl pattern is much more defined, and my hair hardly feels dry.
Gromit, have you tried not washing your hair for a day or two or a few? That might help your dryness. Or maybe just conditioner washing every other day instead of every day shampooing?