^Interesting thoughts. But while maybe you can explain away each individual detail, to me, when a story demands that many cumulative rationalizations to make it fit, that's a sign that maybe it just doesn't belong where you're trying to force it to be.
To me, the only real problem is the Slavers. The other things don't really require much creative rationalizations. Of course, that's just me.
Though, if I were a creator of a new Trek series, I would simply be vague and only touch on what absolutely had to be touched. Only a minimum of backstory would really be necessary because I doubt most fans know much about what "The Slaver Weapon" set up. Still, the Kzinti are too cool for me to leave alone.