Yagr, you may be right that you know tests better than admins and that the test results may not reflect the entirety of your person, your issues and your social environment, to name a few things. From my point of view, it looks like you are over thinking it, which does not have to be a bad thing - it is your health after all. But in this case I think it's best to try answering the questions truthfully and without pondering excessively on a certain answer's impact on the overall result.
Mental health care is far from perfect. One of the things some of us have to come to terms with is putting ourselves in the care of people who don't know us and in some cases don't care to get to know us, or even help us.
However, you can't get help if you don't try the methods and treatments available and in the end, you have to consider the available options and alternatives and make an informed choice.
When you ask yourself what test designers had in mind when they drafted these standardized tests you might come to the conclusion that their main goal was to categorize you into one or more fields, so that you can receive adequate treatment. The tests were drafted for the general masses: women, men, high IQ individuals, low IQ individuals and so on. So sure, the tests lack personalization to some extent and as you said, might fail some people, but they provide a way to assess you and are part of the protocol for doctors in compiling your profile. They are obviously not all doctors rely on. Doctors and techs know the tests aren't fail proof. In hospitals patients often repeat them every few weeks to get a form of status quo.
If I was you, I would make sure there is always communication between you and your doctor(s). Express your discontent with any test results, questionable wording of tests and so on. That way, docs can make notes in your file, start a discussion on possible alternative treatments and so on. You are the one in charge for your health.