At the moment it seems extremely difficult to damage a faction's economic standing - while very easy to improve it.
Famine is the most negative economic state, so just doesn't happen. Even Bust - the less negative economic state - hasn't shown up yet.
Wake Exceptions can show up in Encoded Emissions signal sources, or if you habitually scan whatever's there every time you leave a station they'll stack up well enough. If you need them in a hurry, then Jaques Station in Colonia has a lot of tourist traffic from the 3 beacons nearby, so you can pick up a lot that way - there may be similar alternatives in the bubble as well.
Or ... there's always the DWE for DWE option - go along to the Distant Worlds Expedition departure events this weekend, and scan all the wakes there.