Your comments re: the alternate takes sound like classic Trung OCD to me. Those original versions are just fine and if there's some editing, it's not exactly like Teo's work on "On The Corner" (in which case the unedited masters are significantly different and far superior).
Maybe try "Let My Children Hear Music". Not one of his absolute best but fairly ambitious and one of the more classical influenced sets. And FWIW it was Mingus's personal favorite of his own work.