[Demisis_P2P]

A hard member limit on gangs is not the right way to approach things.

Whichever gang is the best ends up being stacked. This has been observed in every iteration of the gang system. If the member limit is high then the strong gang is even stronger, if it's too low then less active gangs just seem inactive.

What you should have is a sliding scale for gang membership based on a player ranking system. A combination of hours played in the last # of days and kills (or k/d) that generates a "heat" score for each player in a gang. If the total score for your gang is too high then you need to drop a member or two, or hold back on gang activity for a while until your heat drops....
So a top gang might have 10 or 12 skilled & active members, while another gang might be able to have 18 or 19 not so active and not as skilled members.