215 tyres seem a bit wide to go on a 6 inch rim, but that's another conversation.
You may find you go through rear wheel bearings more quickly using the spacers because you will increase the thrust load on the bearings by moving the wheels out.
If the PCD of the studs on the S1 411 is the same as the later 411 a better solution maybe to fit Avon safety wheels, which are 7" wide, and also significantly lighter than the steel wheels.
When I changed from 6J steel wheels with 205 Pirelli tyres to 7J Avon wheels with 215 Avon tyres I noticed a significant improvement in ride and handling. Experimenting with tyre pressure can also yield some improvements.
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