Butters make for bad salt bar, same with lard or palm. They reduce lather a lot.
Best recipe I've found, and I've tried a lot is 80% coconut, 20% olive oil. Use 20% SF and whatever salt ampunt you want, I like 35%
I agree too. I have tried Shea and cocoa butter and didn’t care for either. I use Obsidian’s recipe, or 5% castor, 80% coconut and the remainder olive or avocado. 18-20% SF. After experimenting, 50% salt is my preference with a 7 month cure time.