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First things first, have you eliminated all the easier items that could affect your tire wear? Things like tire pressure, alignment, etc.? Next is the driving you do, like whether you simply drive long distances if you do that unfortunately will affect the longevity. The aggressive driving can indeed contribute to increased wear particularly when the weather gets warmer since these are softer tires. Where you can unintentionally affect the longevity is where the tires are stored, if they're stored in a place with lots of light and heat...that can affect their lifespan. On the burning smell, its worth checking to see that its not brakes.
IIRC the continental winter extreme is asymmetrical so it shouldn't be an issue with wrong tire placement which is the case for directional tires.
As for my own tires, my Gislaved Nordfrost 100s are holding up very well. I suspect I can still get another 2-3 years worth out of them.
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