Apologies. I did not notice your latest posts.
In the first instance you are restricted by what components are available to you... E6/E12...
Then parallel damping, ideal including considerations about losses in the damping circuit itself and burden added elsewhere, is going to be a compromise...
Ultimately you will end up chasing your own tail because the junction capacitances are voltage dependent. What works for one set of conditions, even if it were to be perfect, will be wrong if things change.
Obviously this is a discontinous flyback converter of the QR-ZVS type. The plots of primary voltage show valley switching, which is a basic concept here. Following this there is no point in damping the Lm/Coss resonance.
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