Try this approach... Divide not by number of people but by number of rods used by each side, then you get the ratio correct. That way a man with one rod catching two fish beats another man with three rods only catching five. Makes good sense yeah?
Works up our way with interclub comps. We also allow individual points earned as part of our own club points, it promotes attendance numbers .. esp of those who are up the top end of the points table.(or those who wannabe!)