Bluntness I think your first post perfectly outlines the difference in viewpoints and, maybe, the misunderstadnings betwen many posters! Apologies for dissecting your post!
Transphobia is a dislike or prejudice against transgender people, which is your definition of "transcritical" No! There is a distinction, which is why I think the change to "Gendercritical" might be more useful, or maybe not, we shall see!
I am not prejudiced, nor do I dislike any trans person, at least none that I have ever met, nor do I have an extreme or irrational fear of or aversion to the idea of them, nor do I disbelieve that they exist etc.
Transphobia is basically a spectrum of negative attitudes towards trans gender people. That is your definition and I think it may be a bit to broad, hence your not seeing the distinction between phobia and critical
"Trans critical" I'm not sure is even a thing, Well, I think it is, I defined it and I agreed with A N Other poster that possibly "gendercritical" might be a better word.
Defining the terms, seeing if we can reach any consensus, is the whole point of this thread. So I'm not going to let you get away with dismissing it out of hand 
and by your own description would fall into the transphobia definition spectrum no.. that would be by your interpretation of my definition. I am quite clear that they are 2 entierly discrete things. I can be unafraid of, not hate or dislike transgendered people and yet still disagree with anything they say... just as I can with any other cohort or individual.
In this case it is the loud, insistant, angry transactivists I disagree with and wish to be able to carry on a meaningful discourse with/about without being called names!