I'm pre-op, and on a much higher dose than what you are. Long-term is an issue, even with cis-women, but that's why one must monitor the blood levels. That's how they keep tabs on blood clotting etc.
You will have to take hormones the rest of your life (missing the OEM gonads demands it), and since you're close to the minimum dose already, you should be good to go on that.
Also, general advice on doctors and all medical things you have: You are your own advocate. Don't trust them to read your file, or to know your specific situation.
My mom used to be a nurse (retired now), and there are certain medications she CANNOT take, yet they are the most commonly prescribed for her condition. One time she found herself in an ER, and they were going to give her the wrong medication, even though she advised against it. They insisted. She insisted. This went on for a while, a doc came in and berated her, and she said, "I'm checking myself out of here on my own recognizance, and will be leaving."
Shortly after that, the head ER person complied with my mom's directions regarding her medications.
That's an extreme example, but yeah, they don't always read the charts, and sometimes their ego ("I are a doctor now!") gets in the way. Plus, if you do enough quality research on a subject, it has happened that you may actually know more than they do. Be aware though, that you may not...so do listen to the medical professionals, unless you absolutely know otherwise. (and even then, consider what they say--there may be more than one way to approach and solve a problem.)
Sorry, I digressed a bit. *sigh*