7psi was an example. You can only trick your maf at one setting. Raise the boost and the AFC will not compensate like a mass air meter will.
Truly, you should not tune your own car because you have no real concept of how to do this correctly. Deceiving your sensors will end up biting you in the ass. You have a cheap, effective stand alone computer in your car called and EEC V. Take advantage of it, find a local SCT tuner at
www.sctflash.com and get it dyno tuned properly. Sadly, I know you won't because of some kind of pride in doing it yourself. Get over it. You will need help with this if you want some kind of longevity.