Another thought that has come to mind(not sure if mentioned in this thread) would be buying the CC base defense objectives for each planet you've claimed, but probably limiting 1 per location. This would be hidden info to other players till an attack, but only the attacker would gain knowledge of the defense during the match. If the attack fails, they may reviel the in info to everyone, an ally or keep that info hidden. This may bring more strategy to attack plans.