Hi everybody. Sorry for the late reply, but I'm out working, so not too much time to take a look on the forum.
Trying to answer all questions, I simply remove the small branches from the mother tree and stick it immediately into the soil. I normally use a very loose soil and rich in organic matter. No rooting hormones were used in any of the cases. In addition to the constantly wet soil, when I'm home I use to spray them with water, at least once a day, however I don't do that everyday, as sometimes I spent a few weeks out in row for work. Another thing I remember I did in some, but not in all of them, and can't remember which ones I did it or not, was scratch part of the bark with my finger nail, before putting it into the substract.
Curiously from the takes I show here, the hardest to root, wasn't the Jabuticaba, which is well known for being one of the hardest to take, but the black Pitanga, and the Cherry of Rio Grande, that stayed on the soil for so many months, always green but without doing nothing. If you're going to try this, be prepared for spending a lot of time before you can see any results, and remember these are the ones that had taken for me, but they were not the only ones I planted... Expect some failures as well.
Solko, I had tried so many times with feijoa as well, but I've never had a single take with them, same thing with airlayer, for this species...
Right now I'm also trying some Grumixama cuttings from big leaves, small leaves, softwood branches and semi hardwood branches, and another method for Jaboticaba. As soon as I have some results (if I'll have it) I will share here.
Finally, most of them, only started to show some progress after the temperatures started going above 22/23 degrees Celsius. So I think that maybe the best time to do this would be late winter/early spring, so they will have increasingly temperatures each month, and maybe they could root by the end of summer.
I also forgot to tell that the black Pitanga was in the shade all the time, Jaboticaba and cherry of Rio Grande, were in filtered sunlight and the pitangatuba is in full sun since last January.
Best luck for those who may try this.