I don't know where you're looking for bathing suits to make you think that cause I'm the same size and I can easily find amazing bathing suits but that's besides the point. Bandeau tops are not the best option for bigger boobs because you need a lot more support. I suggest a halter or an underwire top like the last one. I prefer underwire tops cause it gives more support and lift and it seriously makes your boobs look amazing. Bandeau tops will slip off and aren't flattering at all. It suits smaller chested girls better.
If you want support you need a top with wide straps or underwire. A lot of these come with strange bottoms though that belong on our mothers, not us! I don't think any of those 3 tops will give that much support for you if you need support.