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hippy-
Bear in mind, that sometime when you tighten the calipers, the washer will move it a little, so if it look straight now, it may not be after you have tighten it.
You can see it when you tighten it and see the body move very slightly, which make the difference between rubbing and not rubbing, the rotor is never 100% true, so you'll also need to do that by eyes too.
It's worse when you took the wheel out and depress the levers to bring the pads closer, which mean that the slightest the rotor is out of true by, it'll cause rubbing.
edscoble
The dirty secret of disc brakes is that this pretty much happens all the time.
Just that on MTBs nobody cared because they were having too much fun doing rad shit to care about the occasional ping and scrubbing noise.
You can set the caliper up perfectly, but as Ed says, you need to do it by eye, and it's massive faff.