Minimizer bras work by redistributing breast tissue from the front of the bra to the sides. This is useful when you wish to show less projection by an inch or slightly more. The best minimizer bras will do this while still giving you a nice rounded shape and not a flat shape.
If you would like additional shaping, chose a minimizer bra with either a center seam or a lace top cup. Wide, comfort straps should also be a consideration as these will help alleviate shoulder strain.