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sync fets very difficult for you...as you describe..the ringing with Coss.

This is why Easy Peasy's "Booster then LLC" is so good for you.

Sync fets are better if you can get really really low L(leak)..e.g when Ns/Np is very low etc etc.

...or LLC because rectifier ringing is zilch with LLC...just put in a current monitor and turn off when  you go into DCM...ie light enough load.