The defaults again:
- defaults:
  name: global
  properties:
    - throttle:
        max-total: 2
        max-per-node: 1
        maxConcurrentPerNode: 1
        maxConcurrentTotal: 2
        throttleOption: project

maxConcurrentPerNode and maxConcurrentTotal are not valid jjb throttle properties yet this is what i was using to disable in my template:
    properties:
      - throttle:
          throttleEnabled: false

and it should be:
    properties:
      - throttle:
          enabled: false