EDIT DOUBLE CHECKED AND REARS ARE IN FACT 275/30.
I have
19 x 8.5 +29 F 235/35
19 x 9.5 +23 R 275/35
And they seem to fit without rolling? OEM M220. Tires are not 100% but this is what was on it. I like the size and found a good set of 275/35/19 that I am going to pick up tomorrow for it.
Usually I am all about staggering and adjusting ratios. It seems new cars are all coming this way, I would rather have the extra comfort / protection.