Bukkit

What is the issue?
I don't seem to see much or any difference in drop rates, even when the percent drops to 1%. Experience seems to be functioning as expected.

Please provide any additional information below.
Here is my config:
config-version: 1
properties:
  chat-prefix: '&7[&dDDR&7] '
  db-type: mysql
  permission-default: op
  async-db-queries: true
  rate-change: 9.9
  debug-messages: false
  affect-exp: true
  affect-drops: true
  only-affect-player-kills: false
  save-frequency: 300
  minimum-rate: 0.000001
  maximum-rate: 2
  use-metrics: true
mysql:
  hostname: localhost
  username: ******
  password: ********
  port: 3306
  database: minecraft
  prefix: DDR_
mobs:
- BAT
- BLAZE
- CAVESPIDER
- COW
- CREEPER
- PIG
- SKELETON
- SLIME
- SPIDER
- ZOMBIE
excluded-items:
world-groups:
  default:
  - world
  - world_nether
  - world_the_end

I'll take a look at it.

Code wise, I believe a mob's rate would have to drop below 49% before an item will stop dropping. So if 1 arrow drops off a skeleton, when the rate goes below 49% no arrows will drop. If the rate goes above 151% 2 arrows will drop.

Try turning on debug-messages and kill some mobs, there should be a message saying Modifying Zombie's Rotten Fleshx1 * 100% = x1