If you are on Facebook, look for Dr. Will Powers and download his latest presentation. Around page 30 he talks about the problems about 1/3 of his patients have with oral estradiol being converted to estrone in the liver, and the effects that has on feminization. Estrone has only 4% of the effectiveness of estradiol.
It was an eye-opener for me, and when I checked my estradiol, estrone, and total serum estrogen levels they were all out of whack. If you're monitoring estradiol only you're not getting the whole picture. I switched to EV injections about 8 weeks ago, and will be checking the levels in a few weeks. I'm not sure yet, but it does feel like the breast growth has accelerated since I switched.
Note that only 1/3 of his patients have this situation. That means 2/3 do just fine on oral estradiol. Be smart and do your own research and check your levels. Injections kind of suck (I hate needles) but for me, it looks like what I need.
Dr. Powers seems to know his stuff, and really cares about us. I almost wish I lived back in Michigan so I could have him as my doctor.
Good luck!
Stephanie