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@TM
Fit cog, tighten lockring, visually check there is contact between them (some cogs are narrow, which means they don't protrude enough on some hubs to be held by the lockring) if you can see that the lockring is definitely tightening against the cog, tighten it up. Now, go and find a big hill and sprint/grind up it as heavily on the pedals as possible... when you get to the top, tighten your lockring.
This should sort it.
Also, I reccomend a high quality tool such as the shimano above, really cannot explain how much better that is that the cheaper ones, having bent a cheaper chainwhip, and damaged cogs/knuckles with cheaper lockring tools....
...and next time, UTFS.