Simply make us find less metal and more of everything else it will also help to not overflow our limited cargo space so fast...
Or maybe allow the fleet to make stuff with raw material as we fly around? like supply from Metal and ore and volatiles ect...
Even if I make a fleet with like 4 Salvaging Rig I only get stupidly high amount of metal, something every market in gamle is already flooded and thus with and have not specific use.
Finding a bit and tranplutonien ore/metal or luxury ressources a bit more often coudl also help making raiding a bit more interesting