Thats quite a lot of castor. Do you always use that much? How is the soap? No sliminess? Last time i used that much castor i got a soap that took forever to dry, and still a bit slimy till now.
So yeah, i'm curious. Perhaps it depends on the oil combo itself?
I love castor and regularly use it at 10%, sometimes even 15%. I have never had a slimy, soft, or sticky bar. I usually use it in combination with pretty hard oils (OO, tallow, or butters.)