Bob, the rooting medium is about 50% old TGA Super Soil and 50% fresh worm castings. When I say "old", the bag of TGA SS was already a couple years old when my friend got a good buy on it. It smelled badly septic to me. I let it sit in the garage with the top open for nearly a year. It lost the septic smell in that time. I have no idea the nutrient content of it.
"So you have a magic wand!"... LOL actually it is a modified sprayer wand, extended with a length of copper tubing to help reach places, that was once part of a distilling apparatus so it may be magic or think it is...
"I'd love to see you do some without the wax to see if it's really necessary."... Ok consider it done next. The theory in dipping mushroom log ends and sealing inoculation points is it supposedly sterilizes and prevents moisture loss. Food grade cheese wax is used for a couple of reasons, one it is food grade and two it is softer than standard paraffin. Doesn't get brittle and crack, etc. I will get started on them right away.