So Scarebird it is!

Correct! Had to do the same thing with my set up. Not sure about your calipers but mine were bought at the same time from the same company and they look completely different. One required more grinding than the other.

LEARN from my head ache and counter sink the back of the rotor holes you make. Took me forever to figure out that my rotors were the reason my rotors weren't sitting flat had to do with the studs hitting the inside of the rotor hat. The hub of the rotor is what will center it so if your holes are bigger its not that big of a deal.