Anyone else struggle to get a bra that fits?

[Zapdos]

I think maybe I'm just the wrong shape for bras!

I'm slim and small busted, but by boobs seems to sit quite far apart on my body. So small cup sizes aren't wide enough/the cups are too close together and the wire sits on my boob. Bigger cup sizes are wide enough but totally empty at the top (even if I scoop).

Where am I going wrong??

Does anyone else really struggle to get a decent fitting bra?!

I have problems with the straps being too short ..

A friend of mine has a small wide apart bust, she wears something called an 'ahh bra'. It is a pull on bra that looks a bit like a crop top. I have never worn one but she swears by them. I don't think from looking at it, that they are good for the fuller bust?