How I always explained it to people that ask "am I trans enough?" I answer with "If you have
any doubts about your gender, then you are transgender. Period."
I never even heard the phrase "am I trans enough?" until I was on tumblr (in the good ol' days when it was still NSFW), and someone asked that question. I was shocked, having never heard it before then.
My partner is non-transitioning due to extenuating circumstances, yet he is as transgender as I am. (I'm a FTM and currently transitioning.) I treat him like my boyfriend, refer to him as he/him/his under most circumstances, and to me, he's just a long-haired man.
YUM, I LOVE men with long hair! 
When his time and energy allows it, he comes with me to transgender-related events, he attends the local transmasculine support group and trans adult support group, he mostly acts male when he's not at work or around family, he's my guy. <3
If you have any questions about your gender. You are transgender. Period. I stand by that statement.
Ⓥ brought up some very interesting thoughts on the subject, ones I've never thought of before. This is a very interesting discussion.
Ryuichi