A simple suggestion: using your discovery scanner should trigger 2 or 3 signal sources every couple of minutes when used. This would help reduce the material grind to something more manageable as currently; looking for High Grade Emissions is probably the most fun-destroying activity in the game, but is mandatory for higher levels of engineering.
There would be a cool-down to this so you could not trigger too many signal sources at once, and the more advanced the scanner you have equipped, the more likely the chance to trigger rarer signal sources like HGE's or Combat Aftermath.
There would be a cool-down to this so you could not trigger too many signal sources at once, and the more advanced the scanner you have equipped, the more likely the chance to trigger rarer signal sources like HGE's or Combat Aftermath.