Shave ceramic hole instead of re-cutting
I have taken a diamond blade to a few sinks to get past issues, but only cutting the edge to get better clearance for faucet mounting washers. A carefully wielded abrasive bit on a Dremel or regular variable speed drill may do you. 

Do not get it too hot, it will crack. 

Vibration will mess you up as well.

Looks like the mounting flange will cover any small chips that may occur.