What works best for you wrt oxygen?

I have been using oxygen for CH for about 3 years. It works well, but sometimes the attacks come back after I use it. I'm on the waiting list to see a neurologist again and plan to discuss this, but in the mean time, I'm curious: What are your experiences in how to optimize the effects of oxygen? Things such as dosage, duration, how to position yourself while taking it, how to breathe optimally, etc.