That recipe will make a decent shave soap. I have not used my castor oil containing shave soaps enough to tell if it adds much, but initially the lather wasn't as good with that much castor.
My personal favorite recipe is
50% SA (or soy wax)
30% tallow
10% coconut oil
5% shea butter
5% cocoa butter
60/40 KOH/NaOH
half the butters reserved for superfat after the cook, 10% of the total oil weight in glycerine
Probably not a huge difference between them. Check with whatever soap calculator you are using, and make sure you have at least 50% stearic plus palmitic acid in the profile. Anything else is optional.
Interesting, I never thought of using soy wax. My recipe has 59% combined Palmitic and Stearic and your has 71% which also interests me. Im going to try this with the cocoa butter and see how I like it. I appreciate your help and Ill see how it is without the castor. Ill report back! lol