You are ENTP, I wager?
FWIW, the statistics I saw indicated that I/E is nearly evenly split as well, and that only the S/N axis shows a significant skew (at 3:1, as you said).
There is also an interesting nature/nurture question posed by the data in that T/F is only evenly split overall, whereas if you break it down by gender you get a 3:2 split on both sides – in favour of T for men while in favour of F for women.
(I also have to note here that the names “Thinking” and “Feeling” are very misleading. This axis not about thoughts vs emotions, it’s about one’s rational decision-making priority – objectivity vs values. In Socionics, which is similar to MBTI but not identical, that axis is termed “Logic” vs “Ethics”.)
Makeshifts last the longest.