Hi,
Population is dynamically controlled.
You'll want to change
"Day_Time_Spawn_Amount": 14,
"Night_Time_Spawn_Amount": 1,
to
"Day_Time_Spawn_Amount": 14,
"Night_Time_Spawn_Amount": 14,
Suicide timer only affects npcs spawned outside of normal population, such as '/botspawn toplayer' calls or airdrop npcs.
It's there because without population control for those types nothing is limiting their numbers.
Take a low pop server with frequent airdrops, for example...all of a sudden you've a thousand npcs lagging around.