R.J.
LOL... the shaking wouldn't/doesn't work with me, I'd fall out! I have to individually talk rather sternly to the girls to keep that from happening, and place them manually. Then I can do all the handstands I want and they stay put, because once they're in, they're in. There's no room for them to go elsewhere. But I'm a DDD or DDDD, and I wear demi's or underwire sports bras, so perhaps that's it.
I DO put bras on upside down and backwards, clipping at my navel, spin it around, and then one arm in one strap and one in the other. Then it's time for my daily breast exam as I put them where want them, and tell them where to "look".