I would suggest removing type=win32 from the manifest for your SxS component.

So, your manifest file should look like,
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<assembly manifestVersion="1.0" xmlns="urn:schemas-microsoft-com:asm.v1"><assemblyIdentity version="0.0.0.0" name="SoftFX.dll"></assemblyIdentity></assembly>

Let us know if that works.