Hi Chloë,
I'm not sure how much help i'll be since I haven't started anything yet, but I've been on the site for a while so maybe I can give some advice or something. From what I can tell is that a good number of people on here have used progesterone as an aid to help with developing better. Since progesterone is more of a menstrual hormone, I'll help you have better breast growth possibly and more feminized look to the body, such as better fat transfers.
Now I don't wanna be rude here, but it does sound like you are self dosing. There's nothing wrong with it, but you have to be careful in what you take and how much of it. This is why most people see a therapist who than recommends an endo doctor. They provide you with the most accurate levels needed. Make sure you know exactly what you are doing to your body.
Lastly, I'm super jealous of your size 30 band size, heck of a lot better than my size 40 band

. The best idea for that is to either look online and see if there's woman's stores nearby or you could always order stuff from online. The online stuff is harder to do because you have zero idea if it's gonna fit correctly and be right for you. It does save some embarrassment from going into a woman's store.
That's all I got. Hopefully someone else can give you some more help.
Love,
Marty (Sammi)