Proposed changes:
1. Alter the 'colonies' upgrade to also include the trade port income bonus:
Each level would grant a population and trade bonus, albeit a smaller one of each than the separate upgrades.
The maximum upgrade level would be increased by 1 or 2.
2. Use the freed up starbase upgrade slot for a 'Starbase Jump Engine' upgrade. 2 levels:
Level 1: Jump systems. High AM jump cost, On arrival it does not shoot for 30~60secs (or whatever) while power is rerouted to weapons systems. Adds a bit to AM pool.
Level 2: Auxiliar power generator. Lower AM jump cost, no 'power down' on jump arrival, -10% cooldown for weapons and abilities, adds some to AM pool. The aux. power gotta be good for something when the Orky is not jumping, thus the reduced weapon cooldown. I don't consider it OP'ing the OP because 2 SB levels are being used to receive this bonus.