That's a problem that a lot of MBTI professionals are trying to deal with. Genetic personality type is only a facet of someone's behavior and so the requirements of existence is to meet those requirements with adjustments to your own system of being.
In Britain being clever and adaptable (arguably an P trait) are masculine traits, while in United States being a "man of action" (arguably an E trait) is far more important. Those aren't mutually exclusive, but they certainly color how people type themselves and these are two VERY related countries. The trouble is multiplied when trying to test people from Denmark or China.
The question is all about finding the context of your society. Figure out what you do that someone in the same environment as you would not. Think of it like creating destructive interference (for anyone familiar with wave theory... sorry I was a Comm guy in the military and I can't think of a more accessible metaphor).
My advice would be to research some British type authors and read what they have to say about type instead of trying to decipher the U.S. experience. Its not an easy thing to do since most of the material is centralized here, but then maybe Jung might be better (he was Swiss, so at least you're geographically closer). His writings are tough reads, but well worth understanding. He was a very bright man.
I won't be able to judge the quality of conversion, but I'll try to find some resources more in line with your background.
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I was just thinking this morning that I could make a masterpiece project out of writing a computer program that sorted what test to give someone based on their input of personal data and their perception of their environment. Properly done I bet it could increase accuracy immensely.
