The rotors don't warp, they corrode and pit. Because of that the surface swells up, and you get pulsing, just like they're warped. The reason your probe brakes didn't do this, is they are made of metal with more chrome in it, and that costs money. So we get cheap cast iron, that rots. And I've noticed that mine pit on the side that the pistons are on, I presume because there's metal in the pads, there's some galvanic action going on as well.
Also lifts, because of your weather, rotors in that part of the country don't do this.
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