its a few years ago but when i was working for britannia GmbH in germany we had the 767-300 with 328 pax and 8 exits (no overwing exits) minimum crew was 7, 1 per 50 pax and that was caa and lba (the german caa) requierment. i remember in the uk they used 9 crew we started out with 9 but after a few month they cut of the no. 9 so we had to work with 8 cabin crew and quit ofte only with 7.