I personally haven't had an issues with progesterone since I've been on it. It's helped with the areola development, the breast developing, and general fat redistribution alongside the estrogen. Yes bio progesterone has a little effect on your estrogen levels, but it's a very insignificant amount it effects. We also have to realize that during female puberty, women start producing progesterone around the time of their first period and their breasts end up just fine. There is also lot of other factors to consider too such as how many E receptors you have, how sensitive to E, etc. Usually, my understanding is also that with the addition a doctor may increase your E dose if progesterone effects your levels too much, but it's very much your mileage may vary when you take progesterone. This is just bio progesterone that I've talked about because Medroxyprogesterone is a progestin and not a true progesterone which means it has different effects. Yes it can help with breast development, but it also effects your T receptors too, which is was many people will say to use bio-progesterone over Medroxyprogesterone.
TL/DR:
Bio-Progesterone - Minimal effect on E levels and E sensitivity with a bigger effect on breast development, actual progesterone, no real masculization effect.
Medroxyprogesterone - effect on T receptors and more effect on E levels, it's a progestin, can be less effective with breast development and can cause masculization somewhat.
Bottom line your mileage may vary.
