I realize it wasnt your question but I just wanted to mention that my understanding is that you should do your colistin last--or any antibiotic for that matter. The idea being that you do everything to open up, thin out, and clear out before you finally put in abx last and allow them to stay to work on the bacteria. I dont know about you but it makes me cough alot and then you are essentially coughing out a good portion of the abx---so goes the theory.
Anyway for your real question I have done 10mL of HTS at a stint, I was just wondering about doing more about a week ago when I had a cold. Oh also soemthing I find for me to work is after HTS lay flat on my back, read, take a nap, whatever, and then when I get up I am super productive---like it settles into a goopey area that way or something.