I've been using a base soil mix similar to the one Martin showed in the pictures (I cannot remember the brand). I doctored it up a bit, added pine bark mulch, perlite, vermiculite and some SM to it. I didn't measure the ingredients (kind of like I cook), just eyed it up and added until it looked good.
So far, my recently-rooted cuttings get a little wilty in the heat of the day but they spring back after a watering. I have been watering at least once per day, occasionally twice. They are all in one gallon pots.
The ones that wilted too much from transplanting got a top trimming. I removed the wilted leaves and left just buds. All have rebounded and are growing nice new leaves and roots out the bottom of the containers.
John
Zone 7
NC (Piedmont area)