Bringing this back from the dead for any potential new comers. Sure wish I found this thread previously rather than guessing on what should work.
That being said my setup is 17x9 +2 in the front and 17x9.5 -7 in the rear. Tires are Falken Rt660s in 245/40/17 and 255/40/17 respectively. I have minor rubbing on the fender liners during aggressive cornering but that could be cured by raising the car up a little bit.
One thing I would like to note that I haven't see anyone mention, is that when you increase the front tire width so much the car will be more inclined to follow any crowns in the road. Which isn't particularly fun with our steering box setup 😅