Trust your Endo, trust your endo, trust your endo!! Click your heels together three times and say it again!! There is an art to cross gender hormones, and the web here is full of lore that is not supported by scientific evidence. After 4 years on the stuff, with highly appropriate levels and on a very low dose by most peoples ideas, my body has come to where it is going to in that whole time. I am considerably older than you, in fact my kids are 12 to 20 years older than you youngest ones.
When all else fails, lower your expectations and book an appointment with your GT to go over your expectations before you bounce a reality check!!
Both of my daughters (who are in mid 30's to age 40) took about 7 years to get to their full adult growth in, and every time one of their bra's wore out, it was time to get the next size larger. Your mom's breasts did not go from pirates dream (sunken treasure) to Mae West or Dolly Parton size in two weeks, or even two years. We reset our puberty clocks with hormones, but do not enter a time machine with an E ticket to full size by next Friday.