Since it sounds like you were sitting (rather than kneeling), were your feet pressing hard against foot braces? That might cut down on circulation and add to feelings of numbness and cold.
I too live in south Louisiana and have feet that get cold easily. The only times I've worn my NRS desperado shoes in the winter is when there was a dock for launching/landing so feet could stay out of the water. For "wet foot" locations my favorite winter footwear is Chota mukluk lights. After a number of years mine have developed small leaks, but when new they didn't leak at all and they've worked well for keeping my feet warm. If putting aquaseal on the seams doesn't stop the leaks I'll probably buy a new pair of the same style. For cool days I wear them with thin liner socks and on colder days with wool socks. As one who paddles kneeling much of the time, I like the simple design without laces. There is no hardware to press against the top of feet or ankles that are resting on the floor of the canoe.
Kayak Motor Kit
Deck Rigging Gear
Reflective Hull Decals
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