The ACC and the Big 10. Your evidence put BYU at #7 out of 13 in the hypothetical PAC13, which according to my math is exactly in the middle. You said that BYU would be #2 in the Big 12 (out of 11), and above average in the SEC (5th or 6th out of 15, according to you.)
Below average in two conferences. Exactly in the middle of one. Above average in two conferences.