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@M_V
The slippage most likely has nothing to do with your rear cog or lockring or how much you tighten the bearings up on the bottom bracket, it will be because the interface between 1 piece crank and chainring is usually nothing more than a peg in a hole. Peg on crank fits into hole on chainring, and it's usually nothing like a tight fit which is fine when it's only used to pedal forward - the peg rests against one side of the hole and exerts force on it - but if used fixed the peg will move back and forth in the hole giving the feeling of slippage. It will wear badly and really isn't up to the job.