There are a few options available to smaller clans have, in my humble opinion, that has so far worked very well; support larger clans for return favours, join them or work around them. We have numerous smaller clans helping us out and in return have provided a protected port with nice ship and port upgrades. We need them just as much as they need us. No extortion required, it's a game of collaboration(s). We work together to make the best out of it. To limit a clan size would be to cut off a limb to preserve a few. If you are British nation feel free to contact me - we offer missions, trade, ships, resources, materials to all those whom simply need to ask. No ego control just, the promotion of a better game for all regardless of flag.
Enjoy Captain.