I believe each drs should have a dark sector. After the map has been completely cleared of all cerb (excluding interceptors and ghosts) and no player ships have been warped out the dark sector will spawn a large cerb base in the center surrounded by lots of extra harder cerbs. This sector should be hard enough it requires careful coordination of the games strongest players to crack. It should never be possible to solo with one bs like the rest of the game. This is intended to actually be a challenge with rewards to suit. Rewards would be 1 or 2 additional arts but at a 2x bonus to the normal arts you get from that star. So for example a 318% would become 636%. This would be available only once a day and only in the players max level rs.
By keeping it contained to a single sector I believe casual players who make up the majority of the player base will be left unaffected since they can ignore it. However it would give very strong players with nothing to do the last 10-15 min of a drs something to try for.