LOL, you two! Greg, this *is* heaven. Sorry, this is as good as it gets!
So, another day in the cactus house, another pearl of wisdom from the boss. He had been keeping a bunch of cacti cuttings (until he could properly pot them up) in perlite. When he finally got around to it, they already had a thriving root system. His explanation was that perlite absorbs enough moisture to keep things going, but never enough to make things rot.
So your recipe makes sense to me, Arif. Currently my Kalanchoe is in some very very light soil, which I will change A.S.A.P. - thank you! And thanks for more lovely blooms.