Just put 295/30 19 at the rear and 275/30 19 at front, all PSS and problem solved. As close to stock set up as possible in terms f/r balance, rev per mile, overall diameter. And stock wheels will be good enough for those. You will have zero rubbing or fitment issues, less so than stock sizes; just slightly heavier tires with very large contact area. That will likely be my next set (just for curiosity, otherwise I am happy with the stock sizes).
"The mark of a great car is one whose overall competence exceeds what you should expect from its individual components and the 1M does just that", Chris Harris.
2012 BMW 1M: TECH: Evolve Race+N55mids, Evolve IC, Michelin PSS, ER cp, aFe filter, CDVx, Vorshlag camber plates, P3Cars, OCC EXTERIOR: trunk spoiler, blacklines, black grills, IND goodies INTERIOR: Alcantara steering wheel, steel pedals, custom mats, MPower e-brake.