I simply raised the number of raiders at various interior and exterior locations. So instead of fighting 3 raider at an encounter you will now fight about 10 enemies.
Changed areas are (among others): Bethesda Ruins, Anacostia Crossing Station, Montgomery County Reservoir and Foggy Bottom Station.

Thera are two files, one adds raiders to exterior places all over the wasterland, the second adds raiders to metro stations (interior places) and some bunkers.

Screenshots show only dead raiders because I had difficulties to stay alive. I also used my other mod Raider Girls, type3 body replacer and various clothes found here on FO3nexus for the screenshots.

Did an update to both files, you may try the Super Duper Market now ;-)