Well, I got INTP on your first 5-6 tests. I'm maybe 90% sure. And if I'm not INTP, INTJ wouldn't be my first pick. The more I learn about the real meanings of P vs. J the more certain I become that I'm no J.
People often have quite weak functions other than their inferior, so I don't think this is a good approach. I think you were onto something good with the first versions of your test, and you could have tried fine-tuning the definitions of the dominant functions rather than changing the format entirely. They were working quite well for Ti and Ne users, maybe they would have worked better for others if you'd worded the definitions somewhat differently.