oook did some experiments... just counting the size of the delta streams: 17346B for 26^4 and 16852B for 32^4 (as described above)
interestingly, the sweet spot is a mix at 30^4 at 16797B
interestingly, the sweet spot is a mix at 30^4 at 16797B
But more likely one of us has a bug in their logic.