@ Thabai:
Welcome to the forum! I don't know about hybrid system, so can't answer your question. Just drop in to say hello. What's your goal size? I think 30C is really nice size. So if you only to increase a cup or so, it will usually only take you 2 months if you are a fast responder. Many people here gain an inch very quick even they started with A or AA.
Regarding cup size, write to Lucy and tell her the figure of your frame, heigh, weight, etc,... and she may suggest for you. My advice is that you should by larger domes together with the domes that are suitable for you, so when you fill the smaller domes, you won't have to wait.