I tried putting them in the tire size calculator but it just says that the front are good since they are OEM and the 245/35/19 for the rear is 1.2% slower.

My front OEM 225/40/19 Hankooks are brand new and would like to keep them, but will change them to 225/35/19 when they are done to help with my rubbing since my car is slammed on Stance coilovers.

Just need to replace the rears for now that's why I want to size them down to either 245/35/19 or 255/35/19 to prevent rubbing, but don't want to throw of the VDC with stock front tires.