I suffer from oily skin too. I was on 4 courses of accutane, but the last time I started with only 40mg (I am a 80kg male), and gradually lowered my dose to 20mg a week. It worked perfectly, the side effects were minimal, and I was using 10% BP also. I was acne free, but after I stopped I got super oily, I guess because I wrecked my skin (I am oily only where I used the BP).
My advice is to take the low dose, but do not put any topical on your skin that messes with your sebaceous glands, it is