Change so to claim Camp the guild must have +5 supply running and to claim Tower, Keep, Castle the guild must have at least 1 off Power, Precision, Toughness, Player heal, +10% healing running to claim it and when the time run out the guild lose the claim.
You can also add so if the guild that claimed Tower, Keep, Castle have 1 buff running then a other guild that have 2 running can claim it.