Total side question here... did you really add the sugar at trace? Normally you would dissolve it in the water before adding the NaOH (or in some separated water that you use to dissolve the sodium citrate).
Back to the main question, I don't think you didn't anything wrong. High castor recipes tend to be a bit softer, and saponification tends to take longer in cavity molds generally due to less mass (which generates less heat). This is why I put my cavity molds on a heating pad.
You can also put them in the freezer to harden up. After you set them on the counter for about 5 minutes, condensation will form, and they will release easily and cleanly. They may still be a bit softer after they defrost, but by then, they will be safely on your curing rack where they won't get dented or dinged.