I don't know why it took me so long to think of using powder instead of making liquid soap. It's so much easier! Not that the original liquid recipe was hard, but this is a sinch!
I grated 2/3 of a bar of Zote and added 2 cups each of Borax and Super Washing Soda. I also added 2 cups of OxiClean since I add that to every load.
Then I add 2 Tbsp (1/8 cup) to 4 Tbsp (1/4 cup) per load, depending on how dirty the clothes are. (I add a full 1/4 cup when I'm washing DH's work clothes.