It's probably all something of a spectrum and we are indeed all different. I'm not sure you necessarily have to
hate your parts to be considered incongruent? As Allie says, it's close to the idea of alignment so it's a sense of being mis-aligned, not fitting, not harmonious, not suited. The latter is quite a good word for those who see gender expression as the outer clothing. If you want to approach it from the more positive perspective '
this is what I know is right' I don't see a problem with that. More of a, 'this is what is aligned' rather than 'this is non-aligned'.
Some of us hate what was down below. Others just know it's not right. Allie's "significant unhappiness" is a very good way of putting it. Whether you approach that from the negative about ridding yourself or from the positive about embracing, seems to me to be part of the same colour palette.
I wasn't going to share this but it seems appropriate here, so I will. The other day my laser hair removal lady, whilst she was working down below, asked me, 'Are you going to miss it?' It was an interesting question and I paused before replying. What I eventually said was, 'I'm really looking forward to having a vagina, to completing my female anatomy.' In other words, more about congruence than incongruence, or alignment than non-alignment.
@Sephirah put it perfectly: 'Sometimes unhappiness isn't the catalyst. It's just... "this is who I am". Rather than "this is who I am not"'
I feel as if I'm repeating myself without adding much so I'll graciously step out at this point

xx