According to the Developer board at the Astro Empires forum, a new debris formula will be implemented next week sometime. Currently, the formula gives debris at Unit Cost X 2% per armor level. The new formula will give debris at Unit Cost X 10% + 1.5% per armor level. What does this mean for us? It means anyone with Armor level 20 or higher will see less debris than before, while new players will see more debris.
More information can be found at http://forum.astroempires.com/viewtopic.php?f=3&t=67200