Ummm...okay, now I got INTP.
And unlike the other tests I'm not sure what each question is supposed to measure.
So...I'd say great job, but others don't seem to be experiencing the same thing. So maybe not.
I don't know which format has the most potential, but at this point I think you should just pick an approach and try to refine it, to make certain options resonate with the people they are supposed to resonate with. As long as you keep giving the tests complete overhaul after complete overhaul, you can never tell what exactly isn't working.