How would i go about to change the enemy AI to acutally... upgrade there techs? I mean its annyoing having 45 corvets after you.

Well supposedly you could just look into the AI folder and search for the "upgrade_tech" function, perhaps if you change the values it will get a higher priority by the AI, though as long as we don't have anything to proper debug the AI the real consequences could differ greatly from intented ones.

 

Other possibility would be to increase the AI_COMBAT_VALUE of all the other ships, or just those you'd like to see more often (though then this could unbalance the auto-resolve, this is, if we assume auto-resolve works well)