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I am running 225/40R18 Michelin Pilot Sport 2 on STi Enkei 18 x 7.5J ET48 rims and no traction issues. My full suspension set up comes directly from the BRZ tS. I found that the STi axles especially helped eliminate a lot of flex in the rear under heavy acceleration, i.e no more fishtailing down the highway on ramp.... My Legacy STi also comes with 225/40R18 on STi Enkei 18x8 ET55 rims from factory, and I am running Bridgestone Potenza S001's on that and it holds the road just as well as the BRZ and is a lot heavier car albeit AWD.
I too would stay away from a staggered set up and opt for either 215 or 225 depending on rim choice.
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