I suppose it comes down to how you want them to "fit".
Maximum contact patch is easily done but you'll probably have to run a fair bit of camber, roll your rear arches and run the car at a sensible height (i.e. not slammed) - I haven't read what you've already done to the car.
I think we really need to know what ET the wheels are, it is generally stamped on the inside of the wheel where it mounts to the hub or the backs of the spokes.
I'm running 17x8 ET40 and at circa -2 front, and -1.5 rear camber and the outside of the wheels are almost flush with the bodywork.