PFC BOOST

We are doing a 65kHz PFC Boost with Vin=230v Ac, Vout=400v, Iout =0.875 and Pmax=350w. The inductance was about 600uH but finally we chose 1mH. We have had several doubts about some problems that we have had while designing it, so:

-What impact do parasitic components have on a DC-DC converter, and how may we solve it? 

-Why do we have ringing in the input current of the PFC, with the capacitor Cx of the EMI filter, and we remove it, the problem is fixed?

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