I think the types of oils/fats that are used, as well as the fatty acid profile, go hand in hand. I believe it's really beneficial to look at both.
With the caveat that there's no such thing as a one-size-fits-all profile (so much depends on skin-type, water conditions, lathering technique, etc..), here is the fatty acid profile of my hubby's favorite shave soap that I make for him:
Lauric 5%
Myristic 2%
Palmitic 8%
Stearic 42%
Ricinoleic 18%
Oleic 19%
Linoleic 3%
Linolenic 0%
When it came to formulating my shave soap, what I liked to do was lump the Lauric and Myristic together as being one entity, and I also did the same with Palmitic and Stearic. Keeping an eye on those 2 combined sets of fatty acids seemed to make the most difference in formulating my shave soap. For example, going too high with the Lauric/Myristic combo, caused too many of the fluffy kind of bubbles that tend to dissipate quickly (and also contributed to too much dryness). And bringing the Palmitic/Stearic combo up to at least 50% provided enough cushion to my formula that I was able to eliminate clay from my recipe.
As for your % of butters, I'm the odd one out (so far) in that my butter content is 22% of my hubby's favorite formula. lol
Having said all that, though (and just to throw in a curve-ball to dispel any notion that there's a magical fatty acid profile that one should never cross), a kind fellow-soapmaker on the forum sent me one of his croaps for my hubby to test out. It took hubby a few days of adjusting the water level and his lathering technique, but he got it figured it out after the third shave and ended up really enjoying shaving with the rest of that croap (almost to the point that I got a little jealous- lol). I won't give away his recipe, but he used a whopping 50% butters in the croap, and he super-fatted after the cook with 5% more butters. Also- his fatty acid profile was
so different from mine that I could hardly believe it.
Moral of the story- take those profile numbers with a grain of salt until you've made a batch and have actually tested it out. And then based on the results you achieve, only use the numbers as a springboard of sorts to tweak your formula more to your liking. It very well may be that the profile you end up liking breaks all the 'rules'.
IrishLass