XML File Changes for MSI and Silent Method

[DonAIR]

We are trying to integrate the XML File changes into our packaging (we currently use powershell to handle our XML changing. In doing so, we have it working fine but notice our silent installations don't fill out the values now. Is there a way around this? I assume this is an order of operations things as to why those values are not being set now? So for instance, the below worked perfectly fine until switching to XML File changes:

start-process -filepath installer.exe -argumentlist '/s /v"/passive INSTALLDIR=\"C:\Program Files\AIR"" /v"APPSERVER=MYVARIABLE1" /v"HEADNODE=MYVARIABLE2" /v"DOMAIN=MYVARIABLE3"' -nonewwindow

 Now, those variables appear blank in the configuration files.