My advice: Get rid of the tune! Instead put a FMIC, a high flow air filter and catless downpipes to your otherwise fine set up and I believe you will record better times with easier launch. You may like 18 inch wheels with larger PSS tires better too vs. stock set up.
Better yet, don't do drag races and just track your car with or without a tune
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"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.
BMW 1M-SOLD-: TECH: Evolve Race+N55mids, Evolve IC, Michelin PSS, ER cp, aFe filter, CDVx, Vorshlag camber plates, BMS OCC EXTERIOR: trunk spoiler, blacklines, black grills, IND goodies INTERIOR: Alcantara steering wheel, steel pedals, custom mats, MPower e-brake.