Hi there,
I am an aromatherapy student and fellow acne sufferer (bloomin' hormones!). I haven't heard of using virgin coconut oil on oily skin but have read that it has antimicrobal properties so maybe this is why it's recommended?? Jojoba oil seems to be the oil of choice for unblocking pores and regulating sebum but I have also read that carrot oil is good for acne due to it's beta carotene/vitamin A content. Could be worth a try.
Can I ask how you use the oil at the moment and what dilution you use since you are getting good results? Do you apply in the evening after cleansing? I keep meaning to try my own face oil but never get round to it!
By the way, I think it is also good not to use the same essential oils over a long period of time and you could maybe try substituting the tea tree with niaouli from time to time.
Anyway, I'm no expert just a humble student but hope this helps xx