From a personal viewpoint, you mentioned your skin doesn't tolerate palm or coconut oil very well. I'd like to ask, have you tried palm kernal flakes in place of coconut oil??? I have eczema and tolerate palm kernal flakes very well. If I use coconut oil, I have to stop at roughly 20%, and I take a lye amount of 6% superfat. It does nicely for me ; ) Although I love RBO in soaps, I would still drop it down a tad and add half in Olive Oil. Another good oil for sudsing action is sesame oil; the more refined kind made by spectrum that doesn't have a scent to it. Sesame oil is easily found in health food store, or if you have a super grocery store like Wegman's with a health food section. I don't use that high of a %age of castor oil. I use right around 2.5%. On another board a chemist tested out castor oil in CP at different percentages and found the higher the percentage of Castor Oil added after 5% actually dampens lather. Might make your recipe a bit soft too. You can boost the hardening factor by using some shea butter, paiy-na butter and optionally maybe an ounce or two of cocoa butter. Also, crisco for me does irritate my skin. It makes a wonderful soap for most, but I have had more than one person tell me they itch when using those bars. Not sure if it is the additives to keep shortening white, ie BHT, but I dropped it for that reason. I still miss those shortening pours and love the way I could swirl in those batches ; ) Huggs, Bekka