Perhaps successful defensive actions could reward a variable amount of the resource type tied to that base?
Example: Successful defenses of the center base, could reward a portion of Polystellarite to all 'present and participating' members of the faction that currently owns it, regardless of outfit ('present and participating' meaning that they actually chipped in a bunch for the defense).
And if the outfit that owns the base also chipped in a bunch to help defend? Perhaps they can get an extra bit of the base-specific resource, on top of the aforementioned defensive reward that the other same-faction defenders would already get; an extra reward for outfits that stay committed to holding onto vital bases (let alone properly holding and defending the assets that they took, period).
Lastly, taking the aforementioned ideas into account, maybe scale the 'defensive reward' based on how long the base timer spent going 'back and forth', before the defenders finally gain the upper hand and successfully complete the defense.
After all, a stubborn defense that holds out and finally pushes the attackers out after a gruelling 60 minute battle, should surely yield a greater resource reward than a defensive battle that ended in only 30 seconds, yes?
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