[VergeOfDiscovery]

Re: Put very simply, Progesterone acts to develop branching on the ends of ducts formed by estrogens, and in doing so it adds roundness and fullness to the basic triangular shape 'estrogen only' breast development.

It follows that Prog can only work once E has done its stuff i.e you cant develop branches on ducts that don't yet exist. So taking it too early in your breast growth is pointless and in fact may somewhat inhibit further E type growth once terminal branching starts.

I loved the way this was put and for some reason it had me thinking of "ducks" (or perhaps geese) and feathers. You can't have the feathers without the goose, and if you do, all you have is a pillow. Albeit, a soft, comfy pillow!

Or put another way, Get there with E and round it out with P!