How about letting those who place tribe totems use ALL of the land they're laying claim to in the form of the max radius from the outset, since they're already "paying" for it by having to find a large enough area to accomodate it?
If they're not large enough to police all that area and keep people from "encroaching", well, that's the way it goes. It's the same problem they have now.
No one else is hurt, because it's not land they'd be able to use anyway, since it's already within the tribe's max boundry.
If this was the case, then a 10-15 member tribe (for instance) could find enough playable area within the boundry they already control to be happy, despite having to have placed thier totem in a less than favorable overall position at the outset because of interfering solo homesteads.
Seems like a solution that has the potential to leave everyone happy.
The problem with the current system isn't that the largest tribes are having an issue...because they already have this advantage. It's the medium sized tribes, who have to find a full sized tribe area, but can only use a small part of it, that are getting hammered.