I found the same thing with FTS (NC15)--it matches so exactly that it doesn't look like I am wearing anything but balm. I darkened the colour by putting a bit of Dominate on top. It didn't look good on me--made me look like a drowning victim--but I think it could work on somebody with a different skin tone to give it a bit more colour. I almost bought By Design, but hesitated at the last moment, so I'm curious to see your swatch.Just doing up my swatches now and I am super disappointed in the lipsticks, except Just a Bite which is AMAZING.
SS was patchy on me and a lot like Boyfriend Stealer. By Design didn't really show up and accentuated my lip lines. FTS was pretty much my lip color. Exactly.
SWATCHES (including comparison swatches) TO COME!
On the other hand, I love Sex and the Oyster. I can't really carry off darker shadows in general, but this one I can wear since it has a lot of sheen which lightens it up, but it's subtle and not glittery.