brake upgrade
 

I have a 2003 vert and want to upgrade my brakes to 14 in rotors front and 13 in rear with the complementing calipers that fit baer erdispeed plus kit.
But I have the Ruff deep dish rims and a 19 in front 20 in rear tire setup. If the calipers won't fit due to the rim clearence can i gring down the back of the calipers enough to make them fit without effecting the performance of the calipers.

second question

what is the most efficient ? I now have a 19 in 20 in set up wheel wise woild I get better handling if i went with a 19 or 20 all around?