The important thing, IMHO, is that your development is going well and you are feeling good.
My doctors (an endocrinologist with extensive experience with transsexuals and a general practitioner who wrote a book on female hormones) are comfortable with higher levels (I've had as high as 4,000 pg/ml on injections) and deemed it was safe based on blood test results and my response. To each their own.
In women, levels fluctuate a lot. During a menstrual cycle, depending on the lab's range and the woman, levels can be anywhere from 20 to up to 760 pg/ml. During pregnancy, they can go as high as 75,000.