I fight with adult acne also. I have been around and around with my dermatologist to no avail. Really, the only thing that has worked for me is a tanning bed. I tend to not get the white head zits but the under the skin ones. They hurt and are mainly more annoying then anything.
I have tried everything under the sun to try and stop the acne breakouts but I think mine are more stress induced than anything else. I can eat pretty much anything without an outbreak so I am certain that it is not food induced.
I have never tried the above listed things but I have certainly just accepted the fact that it is there and it may never go away. Grrr!