1. Beach Rules:
http://www.wfdf.org/sports/rules-of-play/cat_view/26-rules-of-play/44-beach-ultimate
2. Start the stall count at the lower number
3. The official rules do not allow for any variation to the gender ratio in that example, but each event may have it’s own rules. I would suggest that the team with not enough females play with only 6 players (5 men, 1 woman).