Several tracks were reissued on Verve compilations with much better sound. To me it sounds like Pablo used an old tape transfer, where Verve had access to much better sources. Now whether these still exisr after all those vault fires is another question.
The Jazz Scene double CD includes all takes of Tanga not available anywhere else.
There is a Proper Box, too, but I'll have to compare first.
Details can be found on discogs.
I for one never understood why they did not give Machito a similar treatment like they afforded the Chico O'Farrill sessions - there would have been some overlap, of course.