Let's look at numbers, over time. Memphis A300. (Easier to compare with no RFO Capt\FO's to throw into the Mix.)
May SIG notes
2019 BLG 88:30/92:30. Equivalent flying, so if my wacky theory is correct...should be fewer flying lines for FOs and more flying lines for Captains.
And, the Flying\VTO\Reserve breakdown goes
202/60/33 for a total of 295 Capt Seat
190/52/28 for a total of 270 FO Seat.
Lower BLG target = more flying lines
More bodies = More VTO and Reserve Lines
2015 (old school rules)
BLG 94/94
195/68/66 for 329 Capt lines
195/57/59 for 311 FO lines.
More bodies = More VTO and Reserve lines
2014
BLG 67:13/ 65:23
236/68/65 for 369 Capt Lines
245/52/81 for 378 FO lines.
Lower BLG = more flying lines
More bodies = More VTO and Reserve lines.