Get yourself a sheet of 80 grit sandpaper, put it on a flat surface, (the floor) Get the pad, sand away, until you feel you took off enough material to that pad.
Repeat, on the others.
By the way, it isn't that uncomon for pads to be tight, not fit, if replacing both new rotors, and pads at the same time.
Manufacturers tolerances aren't always the greatest when dealing with modern day parts.
When i was a full time wrenching mechanic, i ran across this from time to time, doing a full brake job.
Sanding the pads did the trick.
Don't loose any sleep doing it.
Doing brakes isn't rocket science.
