This kind of thing is a natural side-effect of increasing actors in the game, I've found. I run Oscuro+Martigen (and often FCOM) with mods like Tamriel Travelers, Crowded Roads and other NPC-adding mods and I find that the more Creatures/NPCs I add the more dead bodies I find. There are patches to make the factions of a few mods more friendly, but I think there is only so much one can do without throttling the feeling of dynamic life these mods add.
Me, I would rather deal with the few problems that arise from a living, breathing world than walk around in an empty, dead one. It's a trade-off I'm happy to make.
It's probably not what you want to hear, but you don't have to loot every corpse you find. I don't.