WiX - Sequencing Custom Action and Service Install

I'm putting together an install for a Windows Service (managed). I'd like to be able to update its config file based on user input from a dialog. The config file gets updated properly and the windows service gets installed, but it doesn't look like the service is picking up the changes in the config. Am I messing up with the sequencing? I want to run my Custom Action "ServiceConfig" before the service gets installed and started.

Here is a scrubbed excerpt from my WiX files:

<Component Id="cmpXyzService.exe" Guid="NOTAREAL-GUID-90X5-12C5-ABC123XYZ890">
    <File Id="file_XyzService.exe" KeyPath="yes" Source="$(var.SourceDir)\XyzService.exe" />
    <ServiceInstall Id="InstallXyzService" Name="Service.XYZ" DisplayName="XYZ Service" Start="auto" Vital="yes" Interactive="no" ErrorControl="normal" Type="ownProcess" />
    <ServiceControl Id="ServiceControlXyzService" Name="Service.XYZ" Start="install" Stop="both" Remove="uninstall" Wait="no"/>
</Component>

<CustomAction Id="SetPropertiesForService" Property="ServiceConfig" Value="[SERVICEINSTANCENAME],[CONFIGVALUE1],[CONFIGVALUE2]" />
<Binary Id="UpdateConfigFileCustomAction.CA.dll" SourceFile="$(var.UpdateConfigFileCustomActionDir)\UpdateConfigFileCustomAction.CA.dll" />
<CustomAction Id="ServiceConfig" BinaryKey="UpdateConfigFileCustomAction.CA.dll" DllEntry="EditConfigFile" Execute="deferred" Return="check" />

<InstallExecuteSequence>
  <Custom Action="SetPropertiesForService" Before="ServiceConfig" >NOT Installed</Custom>
  <Custom Action="ServiceConfig" After="InstallFiles" >NOT Installed</Custom>
</InstallExecuteSequence>

Here's a trimmed-down copy of the InstallExecuteSequence table from Orca

StopServices    VersionNT       1900
DeleteServices  VersionNT       2000
RemoveFiles                     3500
InstallFiles                    4000
SetPropertiesForService NOT Installed   4001
Serv开发者_运维问答iceConfig     NOT Installed 4002
InstallServices VersionNT       5800
StartServices   VersionNT       5900
RegisterUser                    6000
RegisterProduct                 6100
MsiPublishAssemblies            6250
PublishFeatures                 6300
PublishProduct                  6400
InstallFinalize                 6600
RemoveExistingProducts          6601

Apologies if I have edited out something important - I didn't want to dump everything I had. I believe I've included everything relevant.

As per last comment:

This caused a kerfuffle back in 2006. I did find this workaround though. Basically, WiX doesn't recognize the RunInstallerAttribute.