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If they were actually fall cauliflower, they were planted too late - which could account for their untimely heading. It has been known for seeds...
I phrased my answer badly, not actually "regrow" - they won't grow any more in the winter, but may produce smaller secondary heads. I don't...
Often, if you follow a branch back, you'll find some small side branch that you can prune to. If that's not the case, try doing some thinning....
Though they're called "winter" cauliflowers, they don't normally head in mid-winter; they normally head in spring or maybe late winter for the...