07 S2R 800 Big Brake Question

[CabbageFumes]

I picked up an 07 S2R 800 that came with 300mm brake rotors originally, but the previous owner attempted a big brake conversion and did it poorly. The rotors are 320mm, which is expected. The calipers are gold 900/750/etc as expected. I've read that this is a pretty straightforward swap, but something in this particular swap isn't right. The calipers have the mounting ears ground down about 5mm for the rotors to fit. This can't be right. I've confirmed that the calipers are the ones that are supposed to be the ones that are a plug and play fit. Is it possible that the rotors are from an incompatible model with too much offset? I can see the rotors sticking out on either side when looking at it straight on. If the rotors had half as much, or maybe no offset, it seems like the calipers would line up correctly. What am I missing here?