[BloodyButcher]

Why not just change XP to something you get from killing/EMPing ships.
Roid cap can be based on score/value of planet and score/value of alliance its in.
Attacking a small planet in a small alliance when you are a big planet in a big alliance should give you a very low cap rate, regardless off the roidcount of the target planet.
Change around the "contributing score" a tag gets from a planet to only the score gained while in the tag.

The brazillians have played "proper" PA aswell, but i know they hated the fact that it is a hiearchy to in alliances/gals/univers who can end in the top, regardless of activity/skill/dedication.
Good team spirit rarely get you into the top without broken XP, atleast with XP this round, team efforts will guarantee you a place in the top.