If you are a 34B then you already have a 32C.
Sometimes we have to buy bras that work best for the shape of our breasts. For instance I fit great into a 32C padded bra, but I cannot wear any sized Demi style because I have very little tissue up top. So maybe just look at different style bras that suit you better? The types of bras you are wearing in the pictures are awful for me. I think you have LOTS of tissue up top and anyone calling you flat needs smacked.
Also there is nothing to be afraid with getting sized. I think you are actually making your boobs look smaller with wearing a bra too small! That's what I was doing.
Anytime I've been sized it is over a shirt. They don't have you take your bra off or anything like that and I've gone to VS. The sizing literally took 10 seconds and it is while you are dressed!
I posted this link in another thread, but you may want to check it out for yourself. There's also a video on there too!
http://www.figleaves.com/uk/fitting_room.asp?cat=234&txt=11483