I do not use soybean but I happen to really like Canola oil and really do not like Olive oil in soap. Canola oil whether HO or regular has never caused dos in my soaps. Avocado is another favorite of mine used up to 20% and have never had dos with it. I have had dos problems, big time with lard, but I do happen to love the feel lard brings to the soap so I use it. I just use more tallow than lard with sunflower, canola or avocado and castor oil.