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ok first off, don't have rotors turned. That shaves metal off of them, and thinner metal warps faster than thicker metal. In other words, every time you have 'em turned, you're shortening the time between now and the next service to the brakes. Rotors are cheap, and the labor is less extensive to just replace them (unless they have crappy on-car turning machines, they gotta take the rotors off anyway if you have 'em turned)
The back brakes do maybe 20-30% of the braking - often they do less. So the front pads are gonna wear a LOT faster than the rears.
My best guess would be the turning didn't smooth them out enough.
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