Hi,
I first started thinking about a feminised version of my given name, but considered it as a potential gender signifier and wondered if that on "bad or marginal passing days" it could be counterproductive....i.e. Reinforcing the doubt in another's mind...for example, "Oh Christine is your name ..(them thinking at the same time, umm...you were most likely born Christopher then).
I think if you pass really well, it would be OK, but perhaps a fully feminine name may be better as it may help to dilute or snuff out any doubt in another's mind.
Then I ended up checking the popularity of names for my age group until I got one that just felt right and luckily matches my existing signature.
It might sound a bit pragmatic but I ended up with a name I am really fond of.
Also, If you get on with your immediate family too, choosing the name that you my have had had you been born in the right body could be a useful "please accept me" aid. Just thinking out loud a bit there.
Ultimately though it's all about you. What makes you feel most like you. I think that is the right name whatever it is.
Dawn