Hi Samantha,
Well done and don't worry about your PM dose; I am currently on 2000 mg a day, which is the recommended dose for a genetic male [1000 for a female]
If you intend to stop taking PM, there are two considerations, you should keep in mind and they are quite contradictrory.
Firstly, boobs are a very different shape to moobs and you can suddeny reach a point where the realty of your chest can no longer be concealed. A tape measure only tells a part of the story. It cannot tell you how much growth you have under your armpits or how much growth you have on your upper chest; ie how fem your growth looks. This has come home to me recently, as I have been getting significant growth on the upper part of my boobs. In the last week I have noticed that the upper edges of my boobs are becoming quite defined and this is without any increase in cup size. Growth does not happen at an even pace, it goes on fits and starts and you could, suddenly, cross a line, where you have a pair of unhideable boobs.
Secondly, you say you are happy. Have you considered whether, how you feel may, in part, be influenced by the fact, that you have been filling yourself with oestrogen. From not just my experience, but also that of many others, it is clear that PM has a very powerfull effect on your mood, it is effectively femanising your brain as well as your body. After nealy 2 years on PM, I have almost forgotten what it is like to feel male, all I know is that I never ever want to go back to feeling male and smelling male, I think I would rather die, than endure that. I know that I am a nicer, gentler and happier person, than before. I have reached a level of contentement, that I would not have beleived any humanbeing could find. You might just find that, giving up PM, is not that easy.
So there it is and I do not pretend you are in an easy place. I know you have considered the possibility of transition and, to have done so, means you are more than someone, who gets a kick out of cross dressing. I feel you are at a cross roads, in your life and you need to search deep into your soul. If you feel you should have been born female and you prefer the oestrogen driven Samantha, I wish you all the best for a happy and easy transition. If not, it is probably time to get out.
When I started on my journey, it was with the express hope that I would acheive a level of growth, that propelled me into adopting a female role. In that I have succeeded and I have never felt happier, in my life. Friends have been incredibly supportive and I have made new fiends on the jouney. The old adage comes back to me, all we have to fear is fear itself.