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If your PFC'd supply gives a decent power factor and harmonics within limits when on constant load, then you should just forget about it.

Its not part of any standards test.

During one 10ms half cycle, there is a DC offset ....and no-one worries about this either.

You would have to add some sort of DC offset equalisation circuitry, and nobody would do this, nobody is going to pay for something thats not standards tested.