You will need to change caliper brackets then. Post up in the parts wanted. I'm sure there are a few out there with the parts needed. Lots have upgraded to the larger rotors. You are looking for 13 early 14 caliper brackets.
If you go smaller you'll lose some effective brake torque up front. So go to a better pad at the same time to make up for that. Not a bad upgrade I guess since you're losing valuable weight at the axle.