Are you sure it isn't saved Feddie?
I just followed your instructions above.
Set the Bit-Bridge Server to 1.
Then loaded a 32 bit VSTi (Drumatic3.1 by ePhonic)
The I save the project and closed SONAR.
The I ran SONAR again and opened the same project.
Then I went back to Global>VSTPLugins>Bit-Bridge server Configuration.
Sure, it looked like it's been reset to "Automatic" but, when I clicked on the
arrow I could see server 1 was being used and had allocated 17.6 Mb of ram
to Drumatic.
I seem to remember someone saying here before:
To get different VSTs on different server, you choose server then
choose a VST(i).
If you want the next VST(i) on a different server,
first choose a different server, then insert the softsynth.