grub-install doesn't include raid5rec.mod

I just did a fresh install of Ubuntu 14.04.2 using the official install medium onto my NAS. My NAS contains three drives which I run in a RAID5 configuration with LVM on top. I setup each drive to have a 128MB EFI partition which stores grubx64.efi and put the rest of the drive under the RAID5+LVM configuration. The Ubuntu 14.04.2 and 15.04 installs were happy to let me do that however when I try to boot into the freshly installed system the GRUB command prompt came up.

While I was able to see the LVM partitions using ls I couldn't access them because I needed raid5rec.mod. I booted into a live CD and used grub-mkimage to create a grubx64.efi image which had raid5rec.mod, and all the other modules I needed to boot, embedded into grubx64.efi.

Possible resolutions
1. Store all grub modules on the EFI partition
2. Modify grub-install to create grubx64.efi with all block/file system modules embedded into the image needed to access the partition which contains the grub modules
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AlsaVersion: Advanced Linux Sound Architecture Driver Version k3.16.0-43-generic.
AplayDevices: Error: [Errno 2] No such file or directory
ApportVersion: 2.14.1-0ubuntu3.11
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/hwC1D0', '/dev/snd/pcmC1D2c', '/dev/snd/pcmC1D1p', '/dev/snd/pcmC1D0c', '/dev/snd/pcmC1D0p', '/dev/snd/controlC1', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D3p', '/dev/snd/by-path', '/dev/snd/controlC0', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info: Error: [Errno 2] No such file or directory
Card0.Amixer.values: Error: [Errno 2] No such file or directory
Card1.Amixer.info: Error: [Errno 2] No such file or directory
Card1.Amixer.values: Error: [Errno 2] No such file or directory
DistroRelease: Ubuntu 14.04
HibernationDevice: RESUME=/dev/mapper/NAS-SWAP
InstallationDate: Installed on 2015-07-07 (0 days ago)
InstallationMedia: Ubuntu-Server 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
IwConfig:
 eth0 no wireless extensions.

 lo no wireless extensions.

 lxcbr0 no wireless extensions.
MachineType: ASUS All Series
Package: linux (not installed)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcFB: 0 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-43-generic.efi.signed root=/dev/mapper/NAS-ROOT ro nomdmonddf nomdmonisw
ProcVersionSignature: Ubuntu 3.16.0-43.58~14.04.1-generic 3.16.7-ckt13
RelatedPackageVersions:
 linux-restricted-modules-3.16.0-43-generic N/A
 linux-backports-modules-3.16.0-43-generic N/A
 linux-firmware 1.127.12
RfKill: Error: [Errno 2] No such file or directory
Tags: trusty
Uname: Linux 3.16.0-43-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:

_MarkForUpload: True
dmi.bios.date: 05/14/2015
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1201
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: AM1M-A
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev X.0x
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1201:bd05/14/2015:svnASUS:pnAllSeries:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnAM1M-A:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: All Series
dmi.product.version: System Version
dmi.sys.vendor: ASUS