Firstly, turning brake rotors on a lathe usually will never completely get rid of rotor warp. There is a good chance it will return as the damage is already done.
Here is some light reading on how brake warping occurs:
http://www.stoptech.com/tech_info/wp_wa ... disk.shtml
I've had warped rotor issues on all my cars including company cars in the past 10 years. This covers Mazda, Nissan, and Fords. I've tried different types of brake rotors and a few different brake pads and it seemingly makes no difference. The warp still occurs.
My take on it? It's a combination of driving habits and the type of brake pad material. It's not a manufacturing defect or inferior parts. You could put a different driver in the same vehicle and never have a problem.
Since we can't change the driver, change the brake pads. I've had good success with the newer Ceramic composite brake pads. Specifically Satisfied Performance Pro Ceramic. My wife had warped brakes on her Mazda using OEM pads. I swapped in the Satisfied Pro Ceramics 4 years ago... never had a brake issue since. She's on her 2nd set of ceramic brake pads now. My theory is the chances of pad imprinting and rotor hot spots are reduced with these ceramic pads. Regardless, it's solved the problem.
The brakes on my Rogue went a bit longer before warping... nearly 60,000mi. So when the time came, I swapped in the same Satisfied Pro Ceramics and a new set of rotors. I have put on about 8000mi. since with no issues. Time will tell if the rotor warp re-occurs.