Creating Perennially Reserved report outputs a single entry

I am trying to create a report of Perennially Reserved RDMs.  When I check the output I only get 1 entry in the CSV.  I know that there are many more.  I think it has to do with assigning $esxcli for Get-ESXCli.  Thank you for your help.  My code is below:

param(

  [Parameter(Mandatory=$true)][string] $TargetCluster#,

  #[management.automation.PSCredential] $RootCredentials = (Get-Credential)

)

# Retrieve list of Hosts in Target Cluster

$ESXHosts = Get-Cluster $TargetCluster | Get-VMHost | Select-Object Name #| % { Connect-VIServer $_ -Credential $RootCredentials | Out-Null }

#$ESXHosts | ft

# Find the ScsiCanonicalName for all RDM Disks attached to VMs in the Target Cluster

$RDMDisks = Get-VM -Location $TargetCluster | Get-HardDisk -DiskType "RawPhysical","RawVirtual" | Select ScsiCanonicalName

# Retrieve and EsxCli instance for each ESX Host

foreach($ESXHost in $ESXHosts ) {

    $esxcli = Get-EsxCli -VMHost($ESXHost.Name)

    #$esxcli | ft

  # And for each RDM Disk

  foreach($RDMDisk in $RDMDisks) {

  $RDMDisk | ft

  # Collect naa LUN ID and Perennially Reserved value

  $esxcli.storage.core.device.list($RDMDisk.ScsiCanonicalName)| Select-Object Device, IsPerenniallyReserved | Export-Csv -NoTypeInformation -Path "C:\Users\cBurnett\SkyDrive\vSphere CLI Scripts\Set-RDMReservations\get-rdmreservations.csv"

  }

}

# Disconnect the connection objects created for the Target Cluster

#Disconnect-VIServer * -Confirm:$false | Out-Null