xxxJ is someone who extroverts the Judging function (Te or Fe) and introverts the Perceiving function (Si or Ni.)
xxxP is someone who extroverts the Perceiving function (Se or Ne) and introverts the Judging function (Ti or Fi.)
So being "borderline P/J" doesn't really make sense because it implies two completely different value systems. MBTI leads people to this conclusion because it oversimplifies Js as "organized" and Ps as "disorganized" when this is only half the story.
Js value rigid external organization of the environment but maintain a more flexible private perspective.
Ps value rigid internal organization of the self but maintain a more flexible external approach.
J method = "Have a plan to get your life in order and under control first, and then personal happiness and internal contentment will follow."
P method = "Get your personal principles worked out first, and then you'll be able to adapt to and figure out how deal with anything that happens in the external world in real time."