It may be a long shot but if you choose a network to relocate to and only inform those you trust of the 'big move' then those you don't want in your chatroom are not likely to end up on your banlist.
Are there really that many people disrupting your room?
The reason banlists are small is because there is only so much memory available for the banlist. The more bans you allow, the smaller the number of characters are available for each ban.
