A set of tire in the OEM sizes...
255/50 R 19 Front
285/45 R 19 Rear
... give a circumference difference of only 0.3%. Much better.
Question? What tires do you have on it now? Are you on a square setup and moving to staggered? If so, note you will need to obtain a new spare as well - a 155/90 D 18 - as you won't be able to use the old 17" spare with the staggered setup.