My wheel and tire setup - need expert advise.

[DannyGT]

Car: 370z
My ideal setup:
19x9.5 +40 in the Front (275x35x19 tires)
19x10.5 +22 in the Back (305x30x19 tires)

According to my calculations this should roughly give me 1-2mm more clearance on the inside and roughly 13-14mm extension towards the fender. The height on all for corners will be a tiny bit less than stock. I feel this will give a solid and proportioned upgrade from stock and with the right suspension setup will give it a great flush/slightly tucked look.

However, I have a couple of concerns...I see alot of 9.5 fronts ending up with a +22 offset, isn’t that over kill? How will that improve/change the handling characteristics of the car? Wouldn’t that square off all four corners rather than the back wheels having a wider stance (think Porsche)?

My goal is to have an aggressive street setup that I can basically take to the track with little to no modifications. It’s not entirely about the looks; I want to genuinely improve the handling with these mods.