@Spamy I can't find what YOU installed and did. The issue you explain does not happen with vanilla Plutonium and doesn't happen with Bot Warfare alone either
From a quick google search LightNode seems like their are decent.
Comes with it's own IPv4 address, DDoS protection and supports Windows / Linux.
Might be worth to rent it for a few hours to see if its any good.
@Mix-Spam You can't keep the bot server full, so it doesn't allow anyone else to join. You must have a maximum of 17 players between bots and real players.