I think I have the set-up you're envisioning. I have a neutered male in with five females. Sid is the dominant pig, I have a number of really stroppy girls, and Sid being the gentle but firm leader pig that he is keeps everyone in line. I have pigs that I know wouldn't work in pairs, but in a large herd, they get along fine. Sid's a sweetheart though, he's always grooming his favourite girls, and me sometimes, ha. Before Sid, Murphy was the herd leader, but he developed a massive abscess on his liver that was only diagnosed after his death. The group headed by Murphy always worked really well, too. My personal experience, with larger herds where you have several females with a dominant male, has always been very positive. I have a larger cage and lots of pipes and hideys so that the girls can get away from Sid if they want to, and, yes, they do pee in his face a lot to tell him to go away, but Sid is a gentleman and I can't remember the last time the herd got worked up because someone was in heat. Murphy was a little pushier than Sid, but still I didn't have any major issues.