Your base recipe is very cleansing, I would find it way to drying. I would switch it up a bit.
OO 40%
Palm 30%
CO 20%
castor 10%
The 50/50 blend is find, just make sure you split the oils on soapcalc. This is what I would do with the blended oil.
Palm 30%
OO 20%
Rice bran 20%
CO 20%
castor 10%