oh well.. i don't have the time to go thru 7 pages of replies,
in case no one mentioned this.
are u wearing ur bra the correct way?

i went to shop last time and this experienced lady taught me how to wear properly. u'd have to bend down wear them, push your breast up all the way, and then hook ur bra, tighten it.. adjust to ur comfort after that.

that way you wont have that much of gap.
with padded bras, it would be much better also