One of the oldest “keeper” recipes I have has 60% soft oils, 25% CO and no castor. The FA profile shows 15% linoleic and 1% linolenic. It starts out on the soft side, but is very hard by the 3-4 month mark. It turns out to be best bubbler I have, which may not be surprising since most of my soaps are 15% CO (and also 5% castor). Compared with some early soaps I made that had 30% CO and 5% castor, but very low linoleic, the bubbles are as big and abundant. I think the linoleic combats the drying effect of CO and I read recently that linoleic and linolenic FAs also contribute to bubbling. To reduce the chance of DOS with those FAs, the recommendation I’ve mostly come across is to keep the combined percentages at 15% or lower, and the SF at 5% or lower.