Melissa, since estrogen doesn't affect the voice, you put your voice up there yourself, since your a singer, its not that hard for you. But, it is more strain on the voice and does diminish the dynamic range.
My normal vocal pitch range is not AT the FO its about 215-300; its easy to see on the spectrograf, it looks like a mountain with a rounded peek, I''ve got a LOT of variation in pitch when I speak. Different vowels, consonants have a different natural pitch and resonnance for everyone, the resultant mix creates a muddle F0 that's not that defined. If you want more precision, you look at specific vowels, like the ee sound in heed. The enveloppe for these vowels is distinct from male to females and this enables you to compare yourself with a precise metric.
If your F0 too high, your F1 risk on being about the same or lower (that happens when I'm singing in the high end of soprano). The resulting envelloppe is more like a spoken song than a typical voice (I'd be curious if you also have a big formant around 4000 Hertz, that would really make it like your singing).
I'm a singer as well and I could easily speak at F0=335 Hertz for quite awhile (that really sounds weird) but after experimenting quite a bit at different frequencies, I've come back to my original 235 Hertz and just played with the resonnance instead to add rich timbre to my voice, its like adding a trumpet to my orchestra

. At that frequency, I can talk with more volume for longer. That is always good when doing presentations.
Also, a funny thing I saw in a study, the most attractive female voice is slightly higher than the female average (think Marylin Monroe), but the one that inspires the most respect is slightly lower than the female average. So, I guess the female average is what you shoot for if you want it all.