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stevo_com
One of the presenters on Mountainbike Radio (on either "Just Riding Along" or "The Path"[bikeshop show]) reckoned that proper SS cogs only really work with pre-set chain tension (i.e track ends, sliding dropouts, EBB). He said that if you're using a sprung tensioner, you need teeth shaped more like cassette sprockets to avoid chain jump.
The easiest option will probably be to get as close to a magic gear as you can, with the tensioner acting as insurance and accounting for a bit of chain wear.