We have a member who under doctors supervision received a fairly high injectable dosage of estradiol. She posted that her breast growth was minimal. After having that dosage for over a year, she reduced the dosage and started developing. I don't have a hard proof, but it appears that more isn't alway better when it comes to estradiol.
On the other hand, I am an old hand at HRT and had about 20 years of treatment. When I resumed HRT, I went from Premarin to estradiol but I only received a half dosage. Even at a reduced dosage, I gained another cup size, am seeing facial changes and my legs are gaining shape. I suspect that this is due to the fact that estradiol may be more effective, at least with me than Premarin. The dosage definitely isn't a factor.
There isn't any hurry up. Like a CIS woman, this takes time.