I bought a few bustiers off of ebay, and although all of them are supposedly the same size, the fit is so varied! one of them fits perfectly: the side boning doesn't stick out, the cups are supportive, etc. the other two are almost perfect.
one bustier has two issues: misshapen cups, and very noticeable side boning. I tried removing them, but the bustier completely lost its shape so I slipped them back in. should re-attach the boning closer/further from the cups?
on another, the cups aren't supportive. it's almost like the front boning curves away from my bust, causing the underwire to not stay in place--basically, it doesn't stay under the bust. all the bustiers are low-back, and they're tight enough that they should support the bust.
these are just the ebay pics from the sellers--if I have time I'll post pics wearing so you get a better idea of the fit. I really don't know anything on the science of bustiers/corsets, but I was wondering if there was any way I could make them wearable. they're exactly what I wanted, but I don't want to wear something that doesn't fit right.