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Spigot rings are just for fitting, the wheel bolts do all the work. If you get wobble it's because you've used an air gun or you just haven't been careful tightening up the bolts but it is just the bolts that do the work. Just phoned my mate to double check.
Fitting some after market alloys to your car with a different bore to your Hub?
You need to fit Spigot Rings to avoid wheel vibration, another important aspect is that without them, at best you will get wheel imbalance and tyre wear, at worst you run the risk of the bolt holes elongating and eventually the bolts pulling through the wheel