I was actually thinking that you seem to do a sort of Ni/Fi loop, not Ni/Ti loop. So that led me to think you do Fi well because you are around a strong Fi-er, which might explain the infp dad, except now you say he doesn't act infp. My proposition (one of them ) is you get your personality from your parents. If your parents are indeed both NFs (and one a J and one a P) that would help explain why you would do Ni/Ne and Fe/Fi both easily. fwiw, you feel more Fe to me, altho I do feel the Fi. I can spot infps a mile away. But you are very infp-ish too. I'd guess you are just very very close on both attitudes of N and F. I think you should focus on the question of if you use F more or N more. I feel you as more N, very abstract, than F, especially because to be primary F, you'd need to be infp(Fi), which I don't feel as much for you, like I said.
Does any of that make any effing sense?