may i ask if this is a healing salve for psoriasis, or non specific dermatitus? if so, the recommended upper limit for this is 10% and neem is rather odorous. what are you trying to formulate for? you have a nice line-up of oils, i would suggest just increasing the others if you don't wish to use kukui oil. or maybe using rice bran oil, or another light oil? if you are applying to irrated skin, IMHO-i would not use any citrus e/o. maybe a little lavender, immoretelle, palma rosa & carrot seed eo's. plz remember, this is only my best guess.