I have found that I dont get dry skin from a 70% Olive oil, 30% coconut oil 6-7% SF recipe (as opposed to default 5%), so I think your soap would be ok because your SF is 7.5%
However if you can get your hands on some castor oil at 5% (many pharmacies carry it) you will see better lasting bubbles. Some people love higher than 5% superfats, others prefer to balance their soaps so they dont need a high superfat.