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@number6
yes if all BB and rear bearing are tight and chain line is straight and cahinring and cog are not bent (and frame is stiff)- you might be getting loose / tight spots because of not-quite circular chainring / crank set up - is this what you're describing? -i.e. at some points in the crank's 360 degree rotation the chain is tighter than at others
if so then get a dedicated ss/fixed crank and ring. the one off geared bike are not so precise (and incidentally have lower teeth so easier to derail) because you just wouldn't notice a slightly ovaled ring on a bike with a rear mech they aren't made so well.
alternatively it might just be the mount of the ring on the crank spider - some aren't taht accurate- sheldon brown's site has a method to try to get the ring as central (running as circular) as you can. having said that i've had no probs ever running cranks and rings off (geared ) road bikes with 1/8 chain.