I'm a highly visual person, I expect I'd score 5/5 on each of the 16 questions. In the absence of specific hints my brain will happily auto-generate arbitrary

I'm a highly visual person, I expect I'd score 5/5 on each of the 16 questions. In the absence of specific hints my brain will happily auto-generate arbitrary details. My mental imagery does, in fact, "crowd out my actual vision with it's sheer lucidity" as you so well put it. If I need to focus on what I'm actually seeing I sometimes have to exert mental effort to push visualization aside, in much the same way you might push down negative thoughts to calm anxiety before e.g. public speaking. Conversely I find it very difficult to think about things which I can't visualize (but I'm good at coming up imagery to represent things). Most of my internal "dialog" is without words.