I released one of the failing nodes (DL380-G4), ran: maas <session> maas set-config name=curtin_verbose value=true 
Deployed the node and waited till it failed.  
Then I ran: maas maaster node get-curtin-config node-1e6e4f34-3e88-11e6-8da5-001a640920e4
and this is the StdOut:
robin@IbmRS1:~$ maas maaster node get-curtin-config node-1e6e4f34-3e88-11e6-8da5-001a640920e4
Success.
Machine-readable output follows:
apt_mirrors:
  ubuntu_archive: http://archive.ubuntu.com//ubuntu
  ubuntu_security: http://archive.ubuntu.com//ubuntu
apt_proxy: http://192.168.1.150:8000/
debconf_selections:
  maas: 'cloud-init   cloud-init/datasources  multiselect MAAS

    cloud-init   cloud-init/maas-metadata-url  string http://192.168.1.150/MAAS/metadata/

    cloud-init   cloud-init/maas-metadata-credentials  string oauth_token_key=BW2fFMWap4qWJAvA4w&oauth_token_secret=3xfcj8MAtuSRNhJpntC5w86yww2LVzhb&oauth_consumer_key=vnC7UzTtzRU47BvUFj

    cloud-init   cloud-init/local-cloud-config  string apt_preserve_sources_list:
    true\napt_proxy: http://192.168.1.150:8000/\nmanage_etc_hosts: false\nmanual_cache_clean:
    true\nreporting:\n  maas: {consumer_key: vnC7UzTtzRU47BvUFj, endpoint: ''http://192.168.1.150/MAAS/metadata/status/node-1e6e4f34-3e88-11e6-8da5-001a640920e4'',\n    token_key:
    BW2fFMWap4qWJAvA4w, token_secret: 3xfcj8MAtuSRNhJpntC5w86yww2LVzhb,\n    type:
    webhook}\nsystem_info:\n  package_mirrors:\n  - arches: [i386, amd64]\n    failsafe:
    {primary: ''http://archive.ubuntu.com/ubuntu'', security: ''http://security.ubuntu.com/ubuntu''}\n    search:\n      primary:
    [''http://archive.ubuntu.com/ubuntu'']\n      security: [''http://archive.ubuntu.com/ubuntu'']\n  -
    arches: [default]\n    failsafe: {primary: ''http://ports.ubuntu.com/ubuntu-ports'',
    security: ''http://ports.ubuntu.com/ubuntu-ports''}\n    search:\n      primary:
    [''http://ports.ubuntu.com/ubuntu-ports'']\n      security: [''http://ports.ubuntu.com/ubuntu-ports'']\n

    '
install:
  log_file: /tmp/install.log
  post_files:
  - /tmp/install.log
kernel:
  mapping: {}
  package: linux-generic
late_commands:
  maas:
  - wget
  - --no-proxy
  - http://192.168.1.150/MAAS/metadata/latest/by-id/node-1e6e4f34-3e88-11e6-8da5-001a640920e4/
  - --post-data
  - op=netboot_off
  - -O
  - /dev/null
network:
  config:
  - id: eth0
    mac_address: 00:14:c2:c1:fe:ad
    mtu: 1500
    name: eth0
    subnets:
    - address: 10.1.1.152/24
      dns_nameservers: []
      gateway: 10.1.1.100
      type: static
    type: physical
  - id: eth1
    mac_address: 00:14:c2:c1:fe:ac
    mtu: 1500
    name: eth1
    subnets:
    - type: manual
    type: physical
  - address: 192.168.1.150
    search:
    - maas
    type: nameserver
  version: 1
network_commands:
  builtin:
  - curtin
  - net-meta
  - custom
partitioning_commands:
  builtin:
  - curtin
  - block-meta
  - custom
power_state:
  mode: reboot
reporting:
  maas:
    consumer_key: vnC7UzTtzRU47BvUFj
    endpoint: http://192.168.1.150/MAAS/metadata/status/node-1e6e4f34-3e88-11e6-8da5-001a640920e4
    token_key: BW2fFMWap4qWJAvA4w
    token_secret: 3xfcj8MAtuSRNhJpntC5w86yww2LVzhb
    type: webhook
showtrace: true
storage:
  config:
  - grub_device: true
    id: cciss!c0d0
    model: LOGICAL VOLUME
    name: cciss!c0d0
    ptable: msdos
    serial: 600508b1001844395353503958500047
    type: disk
    wipe: superblock
  - id: cciss!c0d1
    model: LOGICAL VOLUME
    name: cciss!c0d1
    serial: 600508b1001844395353503958500048
    type: disk
    wipe: superblock
  - id: cciss!c0d2
    model: LOGICAL VOLUME
    name: cciss!c0d2
    serial: 600508b1001844395353503958500049
    type: disk
    wipe: superblock
  - id: cciss!c0d3
    model: LOGICAL VOLUME
    name: cciss!c0d3
    serial: 600508b100184439535350395850004a
    type: disk
    wipe: superblock
  - device: cciss!c0d0
    id: cciss!c0d0-part1
    name: cciss!c0d0-part1
    number: 1
    offset: 4194304B
    size: 36406558720B
    type: partition
    uuid: db74597b-1b1e-432b-ad4f-6df6047f53cb
    wipe: superblock
  - fstype: ext4
    id: cciss!c0d0-part1_format
    label: root
    type: format
    uuid: f0544d0e-7696-4b88-b0d0-8c7b9857b742
    volume: cciss!c0d0-part1
  - device: cciss!c0d0-part1_format
    id: cciss!c0d0-part1_mount
    path: /
    type: mount
  version: 1
verbosity: 3

Next i will try and deploy the failing node with Wily.

I appreciate your easy to understand guidance and I am eager to help with this and any other testing.