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Secondary burn is pretty common in newer stove designs. We just got a new Jotul that has it.
Those stovepipe add-ons create a LOT more maintenance, increase creosote buildup and concentrations of same, raise the risk of chimney fire, yada yada. Yep that's right I'm not a fan. I've seen them on oil burner stacks and that's a different kettle of fish. Getting more heat out of the exhaust is best done with masonry and/or a nice long run of stovepipe inside the heated area IMO.
We looked into cold air intakes. Our stove experts recommended against them. New stoves don't really draw much air. They only recommend them if the house is really, really tightly sealed, which ours is definitely not.
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